Atabo Red Pike Cichlid

Quick Summary

The Atabo Red Pike Cichlid is a large, powerful ambush predator that demands a spacious tank of at least 1000 litres, expert-level husbandry, and a diet built around meaty live and frozen foods – it is emphatically not a beginner fish and will eat any tank mate small enough to swallow.

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In this guide:

• Introduction
• Quick Stats
• Appearance
• Natural Habitat
• Tank Size and Setup
• Water Parameters
• Diet and Feeding
• Behaviour and Temperament

Introduction

Crenicichla lugubris, commonly sold as the Atabo Red Pike Cichlid, is one of the larger species in the already impressive pike cichlid genus (note: taxonomic revisions have since placed this species in a new genus, Lugubria, as Lugubria lugubris – it is still widely sold under its older Crenicichla name in the hobby). Found across portions of the Amazon basin and its tributaries, this fish has evolved as a consummate ambush predator. Its elongated, torpedo-shaped body, large terminal mouth, and cryptic colouration all serve a single purpose: to lurk motionless among submerged wood and roots, then explode forward to engulf passing prey in a fraction of a second. Watching a healthy adult hunt is genuinely thrilling, and it is this predatory charisma that draws experienced aquarists to the species.

That said, prospective keepers must approach this fish with complete honesty about what it requires. Adults typically reach 35 cm and can grow to 40 cm (16 inches), making it one of the largest species in the pike cichlid genus. They are territorial, aggressive toward conspecifics outside of established pairs, and utterly intolerant of any tank mate they can fit in their mouths – which, given their gape, includes fish that might look surprisingly large. Their dietary needs are strict: they require a varied carnivorous diet of live and frozen foods and will not thrive on flake or generic pellets alone. Water quality must be pristine because, like most large cichlids, they produce a significant bioload. All of this adds up to an advanced-level commitment in terms of tank size, filtration, feeding cost, and ongoing maintenance.

If you have the experience, the space, and the budget, however, Crenicichla lugubris rewards you with a genuinely personable, intelligent fish that learns to recognise its keeper and displays fascinating predatory behaviour unlike almost anything else you can keep in a freshwater aquarium. This guide covers everything you need to know to keep this species responsibly.

Appearance

The body plan of Crenicichla lugubris is unmistakably pike-like. It is deeply elongated and laterally compressed, with a slightly flattened head and a large, upturned mouth lined with small but sharp teeth. The lower jaw projects slightly beyond the upper, an adaptation for striking upward at prey passing overhead – a classic ambush-predator trait. The dorsal fin runs almost the entire length of the back, low and spiny along the anterior portion before rising into a softer, more rounded posterior section. The caudal fin is rounded to slightly truncate, providing rapid acceleration over short distances rather than sustained speed.

Base colouration in adults is typically olive to dark grey-brown across the dorsal surface, transitioning to a lighter tan or cream on the flanks and belly. A bold, dark lateral stripe runs from the snout through the eye and along the midline of the body to the caudal peduncle, though its intensity varies with mood and environment. What gives the Atabo Red variant its trade name is a suffusion of warm reddish-orange to brick-red pigmentation that develops across the lower flanks, ventral region, and the soft portions of the unpaired fins. This colouration is often most vivid in juveniles and young fish, and can remain prominent into dominant or breeding-condition adulthood, though it may become less pronounced as some individuals mature. Some individuals display scattered iridescent spangles of blue-green or gold on the gill covers and flanks, adding to their appeal under aquarium lighting.

Juveniles are more muted, usually showing the lateral stripe prominently against a sandy or olive background with faint vertical barring. Juveniles are noted as being particularly colourful, though like many pike cichlids this fades somewhat as the fish matures into a large, powerfully built adult. Sexual dimorphism is fairly clear-cut: males develop a white stripe along the dorsal fin, while females are generally the more colourful of the pair. Females in spawning readiness may also display a more vivid red or orange belly and a visible ovipositor.

The overall impression of a full-grown Atabo Red Pike Cichlid is one of controlled power. Every aspect of its morphology – the streamlined profile, the oversized mouth, the muscular caudal peduncle – communicates that this is an apex predator within its ecological niche. It is a genuinely striking fish to observe, especially when it shifts from utter stillness to explosive movement in the blink of an eye.

Natural Habitat

Crenicichla lugubris inhabits slow-moving to moderately flowing waters across the Amazon basin and associated river systems, including the Rio Corantijn (Suriname), Rio Essequibo (Guyana), and the Rio Negro, Rio Uatumã and Rio Branco systems (Brazil/Guyana). It favours areas with substantial submerged structure: tangled root systems along undercut banks, fallen trees, accumulations of large branches, and rocky outcrops where it can conceal itself and ambush prey. The substrates in these habitats are typically sandy or composed of fine gravel, often covered with a layer of decomposing leaf litter.

The water chemistry across its range tends toward soft and acidic, with pH values commonly between 5.5 and 6.5 in blackwater tributaries, though populations in clearwater systems may experience slightly higher pH levels approaching neutrality. Water temperatures in these equatorial and sub-equatorial environments are stable, generally ranging from 27 to 29 degrees Celsius with minimal seasonal variation. Dissolved mineral content is low, and the water is often stained a deep amber-brown by tannins leaching from decaying organic matter.

In the wild, C. lugubris is a solitary, territorial predator. Adults establish territories centred on a prime piece of cover – a large root tangle or an undercut rock ledge – and defend it against conspecifics and other large predatory fish. Their diet in nature consists primarily of smaller fish, supplemented by large aquatic invertebrates such as freshwater shrimps and crayfish, and occasionally terrestrial insects that fall onto the water surface. They are sit-and-wait predators rather than active pursuit hunters, relying on camouflage and explosive acceleration to capture prey that ventures within striking distance.

Understanding this habitat is essential for designing an appropriate captive environment. The fish expects dim to moderate lighting filtered through overhead cover, abundant hiding places formed by wood and rock, and clean, soft, acidic water with low dissolved organic waste. Replicating these conditions is not merely aesthetic; it directly affects the fish’s stress levels, immune function, and willingness to feed and display natural behaviour.

Tank Size and Setup

A single adult Crenicichla lugubris requires a minimum tank volume of 1000 litres, with a footprint of at least 180 cm x 60 cm (length x depth). Tank length is more important than height for this species because pike cichlids are bottom-to-mid-water dwellers that patrol horizontally. A pair needs considerably more space than a single fish, well beyond the 1000-litre single-specimen minimum, with plenty of visual barriers and an escape route for the female, since males of this species can seriously injure or kill a female outside of active breeding condition. This isn’t a species to pair casually in anything less than a very large, carefully aquascaped tank. Tanks below 1000 litres will result in a chronically stressed, poorly coloured fish with a compromised immune system and a dramatically shortened lifespan.

The aquascape should prioritise structure and cover. Use large pieces of driftwood, bogwood, or branching manzanita to create cave-like shelters, overhangs, and visual barriers. Arrange these to break the tank into distinct territories if more than one large fish is present. Rounded river rocks and slate can be used to build ledges and additional hiding spots, but ensure all rockwork is stable and cannot be toppled – a 40 cm pike cichlid generates considerable force when startled. Secure heavy structures with aquarium-safe silicone or support them directly on the tank base rather than on substrate.

Substrate should be fine sand or smooth gravel in a neutral colour. Dark substrates tend to bring out better colouration in pike cichlids and more closely replicate the silty, leaf-littered beds of their natural habitat. A layer of dried Indian almond leaves (Terminalia catappa) or oak leaves scattered across the substrate provides a natural appearance, releases beneficial tannins that soften and acidify the water, and creates additional micro-cover for the fish.

Live plants are an option but not essential. Robust species such as Anubias, Java Fern (Microsorum pteropus), and Bolbitis heudelotii attached to hardscape will tolerate the low-light, soft-water conditions that suit this pike cichlid. Avoid delicate stem plants, as the fish’s movements and territorial displays will uproot them. Floating plants such as Amazon Frogbit or Water Lettuce are excellent for diffusing overhead light and providing the shaded conditions that encourage the fish to come out of cover during the day.

Lighting should be subdued. Pike cichlids are naturally found under canopy cover and can become stressed and reclusive under intense illumination. If you are growing plants, position lights to illuminate the planted areas and leave sections of the tank in shadow. A timer-controlled photoperiod of 8 to 10 hours is sufficient.

A tight-fitting lid or cover is important. While adult pike cichlids are not habitual jumpers under calm conditions, they can launch themselves out of the water with alarming speed and power when startled. An uncovered tank with a large Crenicichla is a recipe for finding a dead fish on the floor.

Water Parameters

Crenicichla lugubris is adapted to soft, acidic water and will look and behave its best when kept under these conditions. A pH between 6.0 and 6.8 with a GH of 3-8 dGH represents the sweet spot for most captive specimens. Fish from blackwater-origin populations may prefer even softer, more acidic conditions approaching pH 5.5, but the majority of aquarium-reared individuals adapt well to the 6.0-7.0 range.

Water quality is non-negotiable with this species. A fish of this size eating a carnivorous diet produces a substantial amount of nitrogenous waste. Ammonia and nitrite must always read zero, and nitrate should be kept below 20 ppm through a combination of robust filtration and disciplined water changes. Elevated nitrate levels over extended periods lead to hole-in-the-head disease (HITH), loss of colour, lethargy, and immune suppression. Weekly water changes of 30 to 50 per cent are the norm rather than the exception for tanks housing large pike cichlids.

Temperature stability matters as much as the absolute value. Avoid fluctuations of more than 1-2 degrees Celsius within a 24-hour period. Use a reliable heater rated appropriately for the tank volume – for a 1000-litre tank, two 300-watt heaters placed at opposite ends provide better heat distribution and redundancy than a single unit. A heater guard is advisable, as a spooked pike cichlid can shatter an exposed glass heater with a single impact.

Filtration and Equipment

Filtration for a tank housing Crenicichla lugubris must be over-engineered relative to the tank volume. Aim for a total turnover rate of at least 8 to 10 times the tank volume per hour. For a 1000-litre setup, this means combined filter output of roughly 5,000 to 6,000 litres per hour. A large canister filter – or ideally two canisters – is the most practical solution for most keepers. Brands such as Fluval FX4 or FX6, Eheim Professional, or equivalent high-capacity models are well suited to the task. Sumps are an excellent alternative if the cabinetry allows, providing additional water volume, easy media access, and the ability to house heaters and supplementary equipment out of the main display.

Mechanical filtration should be your first stage, capturing the substantial particulate waste generated by a large carnivore. Coarse foam pads followed by finer poly-fill or filter floss work well and should be cleaned or replaced regularly – every one to two weeks in most cases. Biological filtration is the backbone of your system; fill the remaining canister capacity with high-surface-area ceramic media or sintered glass media. Do not skimp on biological media volume.

Chemical filtration with activated carbon is optional but useful for removing tannin discolouration if you prefer clearer water. If you are deliberately using tannin-releasing botanicals to darken the water, omit carbon. Purigen or similar organic-scavenging resins can help maintain water clarity while keeping dissolved organics in check between water changes.

Direct the filter return to create moderate water movement across the tank without generating a strong current throughout. Pike cichlids are ambush predators adapted to sluggish water; excessive flow will stress them. Positioning the outlet along the back glass with a spray bar or lily pipe diffuses the flow effectively. Ensure there are calm zones behind driftwood or rocks where the fish can rest in still water.

An air pump is not strictly necessary if surface agitation from the filter return is sufficient to maintain adequate gas exchange. However, in very warm conditions above 28 degrees Celsius, supplemental aeration via an airstone can help maintain dissolved oxygen levels, which become critical at higher temperatures.

Diet and Feeding

Crenicichla lugubris is a predatory carnivore whose diet should be built around meaty live and frozen foods, though a good-quality cichlid pellet or flake and some vegetable matter (spirulina or algae wafers) can also form part of a varied diet. Its digestive system is built to process whole prey items and high-protein animal matter. Providing an appropriate diet is one of the most important – and most expensive – aspects of keeping this species.

The dietary staples should include a variety of frozen foods: whole or chopped prawns (shell-on for juveniles, peeled for adults if preferred), lance fish, smelt, whitebait, mussels, cockles, and squid. Frozen bloodworm and brine shrimp are suitable supplementary foods for juveniles but are too small to constitute a meaningful meal for an adult. Earthworms collected from pesticide-free gardens are an outstanding food: nutritionally complete, readily accepted, and cost-effective. Rinse them thoroughly before offering.

Live foods are enthusiastically accepted and can form part of the diet. Live river shrimp, large earthworms, and captive-bred feeder fish from a trusted, disease-free source are all suitable. Never feed wild-caught feeder fish or pet-shop feeder goldfish. These carry a high risk of introducing parasites, bacterial infections, and diseases to your predator, and goldfish in particular contain thiaminase, which destroys vitamin B1 and causes serious nutritional deficiency over time.

High-quality carnivore pellets designed for large predatory cichlids (such as Hikari Massivore or Northfin Carnivore) can be used as part of a varied diet and provide a convenient way to ensure vitamin and mineral intake is adequate. Most pike cichlids will accept pellets once weaned onto them, though some individuals stubbornly refuse anything that does not look and smell like real prey. Pellets should supplement, not replace, whole food items.

Feed adults every other day or three to four times per week. Juveniles under 15 cm should be fed daily. Offer an amount that the fish consumes within a few minutes and remove any uneaten food promptly to prevent water quality deterioration. Overfeeding is a common mistake with large predators; a slightly lean feeding schedule is healthier than a heavy one. You will notice that the fish’s abdomen should appear gently rounded after feeding but never distended.

Vitamin supplementation by soaking frozen foods in a liquid vitamin preparation (such as Vitachem or Selcon) once or twice a week helps prevent nutritional deficiencies associated with a frozen-food-heavy diet. This is particularly important if the fish refuses pellets, as frozen foods alone may lack certain micronutrients.

Behaviour and Temperament

Crenicichla lugubris is a solitary, territorial ambush predator with a temperament to match. In the aquarium, it spends much of its time motionless among cover – wedged into a gap between driftwood pieces, hovering beneath an overhang, or lying still on the substrate with only its eyes tracking movement in the tank. This is not lethargy; it is the natural hunting posture of a sit-and-wait predator. When prey (or food) enters its strike zone, the fish accelerates with astonishing speed, engulfing the target in a single lunge.

Territoriality is pronounced. A single specimen will claim the best piece of cover in the tank and defend it aggressively against any fish it perceives as a competitor or threat. This aggression is not limited to conspecifics; other large cichlids, catfish, and indeed any fish that ventures too close to the pike’s chosen lair can receive a violent charge, jaw-lock, or lateral display. The level of aggression escalates dramatically during breeding.

Conspecific aggression is severe. Keeping two males together in anything less than an enormous system (well over 1,000 litres with extensive visual barriers) is likely to result in the death or severe injury of the subordinate fish. Even male-female pairs can be problematic outside of breeding periods, with the larger male harassing the female relentlessly if she cannot escape his line of sight. For this reason, elaborate hardscaping with multiple visual breaks is essential in any tank intended to house a pair.

Despite its aggression toward other fish, C. lugubris often develops a remarkably interactive relationship with its keeper. These are intelligent fish with excellent eyesight and the capacity to learn routines. Many keepers report that their pike cichlid recognises them, approaches the front glass at feeding time, and will even accept food from forceps or fingers (though caution is advisable – the teeth are sharp). This personality is a significant part of the species’ appeal and goes some way toward compensating for the limitations it imposes on community stocking.

Activity levels tend to increase during dawn and dusk, reflecting the crepuscular hunting patterns observed in the wild. Under subdued lighting or with the addition of floating plants, the fish is more likely to be visible and active during the day. In brightly lit, sparsely decorated tanks, it will typically hide constantly and become a frustrating non-presence in the aquarium.

Tank Mates

Choosing tank mates for Crenicichla lugubris requires a ruthless, realistic assessment of predation risk. Any fish that can physically fit inside the pike cichlid’s mouth will eventually be eaten. This includes fish that a novice keeper might assume are “too big” – the gape of a 40 cm pike cichlid is larger than many people expect, and it will eat any fish small enough to fit inside its mouth. Safe tank mates must therefore be robust, fast-growing species that reach a size the pike cannot swallow, and they must be tough enough temperamentally to hold their own without being bullied into corners. Even then, success is not guaranteed, and a species-only or single-pair setup is always the safest approach.

Good tank mates

• Oscar Cichlid (Astronotus ocellatus) – Large enough to avoid predation and robust enough to coexist, though both species need ample space.
• Common Pleco (Hypostomus plecostomus) – Heavily armoured and typically ignored by pike cichlids; helps with algae control in large tanks.
• Sailfin Pleco (Pterygoplichthys gibbiceps) – Another large, armoured catfish that occupies different tank zones and is too large and well-protected to be eaten.
• Silver Dollar (Metynnis hypsauchen) – Deep-bodied and fast; a group of adults is generally too large for the pike to swallow and adds mid-water activity.
• Severum (Heros severus) – A large, relatively peaceful cichlid that can coexist if given enough space, though monitor for territorial clashes.
• Geophagus surinamensis – Large eartheater cichlid that occupies the substrate zone; robust enough to tolerate a pike cichlid’s presence in a spacious tank.
• Senegal Bichir (Polypterus senegalus) – Armoured, nocturnal, and generally ignored by pike cichlids; ensure the bichir is of comparable size.
• Fire Eel (Mastacembelus erythrotaenia) – A large spiny eel that stays hidden during the day and is too sizeable and spiny for the pike to consume.

Fish to avoid

• Neon Tetra (Paracheirodon innesi) – Far too small; will be consumed immediately and without hesitation.
• Guppy (Poecilia reticulata) – An obvious prey item; adding guppies to a pike cichlid tank is simply feeding them to the predator.
• Corydoras Catfish – Small, slow-moving bottom-dwellers that will be eaten or injured by a large pike cichlid.
• Angelfish (Pterophyllum scalare) – Not large enough as adults to escape predation, and their slow, deliberate movement makes them easy targets.
• Dwarf Gourami (Trichogaster lalius) – Far too small and too slow; will be consumed within minutes of introduction.
• Flowerhorn Cichlid – While large enough to avoid predation, flowerhorns are extremely aggressive and will likely attack the pike cichlid, causing serious injury or stress to both fish.
• Goldfish (Carassius auratus) – Incompatible water parameters, high thiaminase content, and will be eaten if small enough.

Breeding

Breeding Crenicichla lugubris in captivity is a challenging undertaking that is rarely accomplished outside of dedicated specialist setups. The difficulties begin with pair formation: simply placing a male and female together frequently results in the male killing the female. Successful pairing typically requires either raising a group of juveniles together and allowing a natural pair to form (which demands an enormous growing-on tank), or carefully introducing the female to the male’s territory using a divider that allows visual and chemical contact without physical access until mutual tolerance is established.

Once a compatible pair is established, conditioning for spawning involves a period of increased feeding with high-quality live and frozen foods, combined with a slight drop in water temperature by 1-2 degrees Celsius followed by a gradual return to normal. This simulates the onset of the rainy season in the Amazon basin and can trigger spawning behaviour. Water should be soft (GH below 6 dGH) and acidic (pH 5.5-6.5) during breeding attempts.

The pair will select a spawning site – typically a flat rock surface, a cleared area of substrate inside a cave, or the ceiling of an overhang. The female deposits a clutch of adhesive eggs (exact numbers are not well documented for this species), which the male fertilises. Both parents guard the spawn site aggressively, and this is the period of greatest danger for any tank mates. A breeding pair of large pike cichlids will attack anything that approaches the eggs, including fish far larger than themselves, and the intensity of this aggression can result in severe injuries or deaths.

Eggs hatch in approximately three to four days at 26-27 degrees Celsius. The fry become free-swimming after a further four to five days and initially feed on their yolk sacs. First foods for the fry should be freshly hatched Artemia nauplii, followed by micro-worms and finely chopped frozen foods as they grow. Fry growth is relatively rapid given adequate food and water quality, but raising a large brood requires significant space, as sibling aggression manifests early. Thinning the brood by separating juveniles into multiple grow-out tanks is usually necessary.

Parental care in Crenicichla is generally good, with both parents defending the fry for several weeks. However, the male may turn on the female once the fry begin to disperse, so the keeper must be prepared to separate the adults if aggression becomes dangerous. A divider should always be on hand during and after the breeding period.

Common Diseases

Crenicichla lugubris is reasonably hardy when kept in appropriate conditions, but its susceptibility to several diseases increases dramatically in suboptimal environments. The most common health issues are directly linked to poor water quality and inadequate diet.

Hole-in-the-head disease (HITH), also known as head and lateral line erosion (HLLE), is perhaps the most frequently encountered problem in captive pike cichlids. It presents as pitted, eroded lesions on the head and along the lateral line, often accompanied by loss of colour and appetite. The exact cause is debated, but the condition is strongly associated with elevated nitrate levels, poor diet lacking in variety and vitamins, and the use of activated carbon in filtration (though the latter link remains controversial). Treatment involves improving water quality through increased water changes, enriching the diet with vitamin-soaked foods, and in severe cases, treating with metronidazole under veterinary guidance.

Ich (white spot disease), caused by the protozoan Ichthyophthirius multifiliis, can affect pike cichlids, particularly after temperature fluctuations or the introduction of new, unquarantined fish. The characteristic white cysts are visible on the fins and body. Treatment involves gradually raising the temperature to 30 degrees Celsius over 24-48 hours and adding aquarium salt at a rate of 2-3 grams per litre, or using a proprietary ich medication. Pike cichlids generally tolerate heat treatment well.

Bacterial infections, including fin rot and ulceration, are usually secondary to physical injury from fighting or poor water conditions. Maintaining pristine water quality is the best prevention. Mild cases often resolve with improved husbandry alone; more severe infections may require treatment with an antibacterial medication.

Internal parasites are a significant risk for wild-caught specimens and for fish that have been fed wild-caught feeder fish. Symptoms include weight loss despite normal feeding, white or stringy faeces, and a sunken belly. New wild-caught arrivals should be watched for signs of worm infection and, where suspected, properly diagnosed before treatment; praziquantel and levamisole target different types of worm and shouldn’t be used interchangeably.

Prevention across all these conditions comes down to the same fundamentals: a spacious, well-filtered tank with stable, clean water; a varied, high-quality carnivorous diet supplemented with vitamins; and strict quarantine of any new additions before they enter the main display.

FAQs

Can I keep an Atabo Red Pike Cichlid in a 300-litre tank?

No. A 300-litre tank is wholly inadequate for an adult Crenicichla lugubris. This species regularly reaches up to 40 cm and requires a minimum of 1000 litres with a tank footprint of at least 180 x 60 cm. Keeping it in a smaller tank will lead to chronic stress, stunted growth, aggression problems, and a significantly shortened lifespan. If you cannot provide the required space, consider a smaller pike cichlid species such as Crenicichla regani or Crenicichla compressiceps instead.

Will my pike cichlid eat smaller fish in the tank?

Yes, without question. Crenicichla lugubris is an obligate piscivore in the wild and will consume any fish it can physically swallow. Its gape is large relative to its body size, meaning it can eat surprisingly substantial prey items. There is no way to train or condition this instinct out of the fish. Any tank mate must be too large to fit in the pike’s mouth and robust enough to withstand its territorial aggression.

What should I feed my Atabo Red Pike Cichlid?

A varied diet of frozen and live meaty foods: prawns, lance fish, smelt, whitebait, mussels, earthworms, and squid. High-quality carnivore pellets (such as Hikari Massivore or Northfin Carnivore) can supplement but should not replace whole food items. Avoid feeder goldfish, which carry disease risk and contain thiaminase. Soak frozen foods in a liquid vitamin supplement once or twice per week to prevent nutritional deficiencies.

How aggressive is this species compared to other cichlids?

Crenicichla lugubris is among the more aggressive cichlid species commonly kept in the hobby. It is highly territorial, intolerant of similarly sized or smaller tank mates, and will not hesitate to attack or kill fish it perceives as competition or prey.rant of similarly sized or smaller tank mates, and will not hesitate to attack or kill fish it perceives as competition or prey.rant of other pike cichlids in anything but the largest tanks, and can seriously injure its own mate outside of active breeding condition. Compared with many similarly sized South American cichlids, it relies on ambush and sudden ferocity rather than prolonged posturing, so conflicts tend to be quick and can end in real injury.

Related Guides

• Demon Eartheater – Another large South American cichlid requiring expert-level care, soft acidic water, and a spacious tank with similar habitat considerations.
• Altifron Eartheater – A sizeable Amazon-basin cichlid that shares comparable water parameter needs and can help you understand large cichlid husbandry.
• False Tiger Knifefish – A large predatory species from similar South American habitats that demands comparable tank size, meaty foods, and advanced fishkeeping experience.
• Altum Angelfish – A wild-type Amazonian cichlid that thrives in the same soft, acidic water conditions and benefits from tall, well-structured tanks.
• Bucktooth Tetra – A predatory South American characin that offers insight into keeping aggressive, carnivorous fish and managing their specialised dietary requirements.