Photo: Claire H. (CC BY-SA 2.0) — via Wikimedia Commons
Pictus Catfish (Pimelodus pictus)
A bolt of chrome and black spots that prowls the bottom at speed — stunning looks, a real appetite for small fish, and a shoaling nature that demands companions.
Will it live with a Pictus Catfish?
We compare each fish against your pictus catfish on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- Banjo Catfish✅ CompatiblePeaceful · 15 cm · Medium care · 20–26 °C (68–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Bearded Corydoras✅ CompatiblePeaceful · 10 cm · Medium care · 18–24 °C (64–75 °F)
- Compatible on the things that matter: shared water near 22–24 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Bearded Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Black Kuhli Loach✅ CompatiblePeaceful · 8 cm · Easy care · 23–28 °C (73–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–27 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Bolivian Ram✅ CompatiblePeaceful · 8 cm · Medium care · 24–28 °C (75–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Bristlenose Pleco✅ CompatiblePeaceful · 12 cm · Easy care · 23–30 °C (73–86 °F)
- Compatible on the things that matter: shared water near 23–27 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Burmese Loach✅ CompatiblePeaceful · 9 cm · Easy care · 22–28 °C (72–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Clown Pleco✅ CompatiblePeaceful · 9 cm · Medium care · 24–28 °C (75–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Denison Barb✅ CompatiblePeaceful · 15 cm · Medium care · 18–25 °C (64–77 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–25 °C — no size, zone or temperament conflicts.
- Keep Denison Barb in a shoal of 6+ or it gets stressed and nippy.
- Giant Glass Catfish✅ CompatiblePeaceful · 15 cm · Medium care · 22–27 °C (72–81 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Giant Kuhli Loach✅ CompatiblePeaceful · 12 cm · Easy care · 24–30 °C (75–86 °F)
- Compatible on the things that matter: shared water near 24–27 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Kuhli Loach✅ CompatiblePeaceful · 10 cm · Easy care · 24–30 °C (75–86 °F)
- Compatible on the things that matter: shared water near 24–27 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Leopard Frog Pleco✅ CompatiblePeaceful · 9 cm · Medium care · 25–30 °C (77–86 °F)
- Compatible on the things that matter: shared water near 25–27 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Marbled Hoplo✅ CompatiblePeaceful · 14 cm · Easy care · 22–28 °C (72–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Medusa Pleco✅ CompatiblePeaceful · 12 cm · Medium care · 26–30 °C (79–86 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 26–27 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Moonlight Gourami✅ CompatiblePeaceful · 15 cm · Easy care · 25–30 °C (77–86 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 25–27 °C — no size, zone or temperament conflicts.
- Porthole Catfish✅ CompatiblePeaceful · 10 cm · Easy care · 22–28 °C (72–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Rubber Lip Pleco✅ CompatiblePeaceful · 12 cm · Easy care · 20–26 °C (68–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Snowball Pleco✅ CompatiblePeaceful · 16 cm · Medium care · 24–30 °C (75–86 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Spotted Rubbernose Pleco✅ CompatiblePeaceful · 12 cm · Medium care · 20–26 °C (68–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Spotted Talking Catfish✅ CompatiblePeaceful · 15 cm · Easy care · 22–26 °C (72–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Striped Eel Loach✅ CompatiblePeaceful · 12 cm · Medium care · 24–28 °C (75–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Upside-down Catfish✅ CompatiblePeaceful · 10 cm · Easy care · 22–26 °C (72–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Zebra Loach✅ CompatiblePeaceful · 9 cm · Medium care · 23–26 °C (73–79 °F)
- Compatible on the things that matter: shared water near 23–26 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Zebra Pleco✅ CompatiblePeaceful · 10 cm · Hard care · 26–30 °C (79–86 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Banded Gourami⚠️ With cautionSemi-aggressive · 12 cm · Easy care · 22–28 °C (72–82 °F)
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Blue Gourami⚠️ With cautionSemi-aggressive · 13 cm · Easy care · 22–28 °C (72–82 °F)
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Boesemani Rainbowfish⚠️ With cautionPeaceful · 11 cm · Medium care · 24–28 °C (75–82 °F)
- Expect Pictus Catfish to harass Boesemani Rainbowfish at times; give dense cover and watch them at feeding.
- Keep Boesemani Rainbowfish in a shoal of 6+ or it gets stressed and nippy.
- Calvus Cichlid⚠️ With cautionSemi-aggressive · 14 cm · Medium care · 24–27 °C (75–81 °F)
- Different pH ranges (6–7.5 vs 7.8–9); doable if you sit in the shared band, but not ideal long-term.
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Cupid Cichlid⚠️ With cautionSemi-aggressive · 12 cm · Medium care · 24–29 °C (75–84 °F)
- Pictus Catfish and Cupid Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
- Giant Betta⚠️ With cautionPeaceful · 12 cm · Medium care · 24–28 °C (75–82 °F)
- Pictus Catfish and Giant Betta are close in size, but the semi-aggressive one tends to dominate — add giant betta in a group to spread the pressure.
- Golden Vampire Pleco⚠️ With cautionSemi-aggressive · 11 cm · Medium care · 26–30 °C (79–86 °F)
- Pictus Catfish and Golden Vampire Pleco can both be territorial; doable with space and dense planting, but watch for chasing.
- Mascara Barb⚠️ With cautionPeaceful · 12 cm · Medium care · 20–25 °C (68–77 °F)
- Pictus Catfish is semi-aggressive and may chase or nip the smaller Mascara Barb — plant heavily and break up sight lines.
- Keep Mascara Barb in a shoal of 8+ or it gets stressed and nippy.
- Murray River Rainbowfish⚠️ With cautionPeaceful · 11 cm · Easy care · 15–26 °C (59–79 °F)
- Pictus Catfish is semi-aggressive and may chase or nip the smaller Murray River Rainbowfish — plant heavily and break up sight lines.
- Keep Murray River Rainbowfish in a shoal of 6+ or it gets stressed and nippy.
- Pearl Gourami⚠️ With cautionPeaceful · 12 cm · Medium care · 24–28 °C (75–82 °F)
- Pictus Catfish is semi-aggressive and may chase or nip the smaller Pearl Gourami — plant heavily and break up sight lines.
- Polka-dot Loach⚠️ With cautionSemi-aggressive · 13 cm · Medium care · 24–28 °C (75–82 °F)
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Powder Blue Cichlid⚠️ With cautionSemi-aggressive · 12 cm · Medium care · 24–28 °C (75–82 °F)
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Keep Powder Blue Cichlid in a shoal of 6+ or it gets stressed and nippy.
- Rainbow Cichlid⚠️ With cautionSemi-aggressive · 14 cm · Easy care · 22–28 °C (72–82 °F)
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Swordtail⚠️ With cautionSemi-aggressive · 14 cm · Easy care · 22–28 °C (72–82 °F)
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- T-bar Cichlid⚠️ With cautionSemi-aggressive · 12 cm · Medium care · 22–28 °C (72–82 °F)
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Tiger Betta⚠️ With cautionSemi-aggressive · 11 cm · Hard care · 22–27 °C (72–81 °F)
- Pictus Catfish and Tiger Betta can both be territorial; doable with space and dense planting, but watch for chasing.
- Alligator Gar⛔ Not recommendedAggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
- Two assertive fish, one genuinely aggressive: Pictus Catfish and Alligator Gar will hold territory and clash.
- Alligator Gar may bully the smaller Pictus Catfish, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Your 210 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
- Clown Knifefish⛔ Not recommendedAggressive · 90 cm · Hard care · 24–28 °C (75–82 °F)
- Pictus Catfish and Clown Knifefish are both territorial and at least one is outright aggressive — expect serious fighting.
- Clown Knifefish may bully the smaller Pictus Catfish, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Your 210 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
- Mbu Puffer⛔ Not recommendedAggressive · 67 cm · Hard care · 24–28 °C (75–82 °F)
- Pictus Catfish and Mbu Puffer are both territorial and at least one is outright aggressive — expect serious fighting.
- Mbu Puffer may bully the smaller Pictus Catfish, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Your 210 L tank is below the ~757 L this pairing really wants — crowding raises aggression.
- Ocellaris Peacock Bass⛔ Not recommendedAggressive · 70 cm · Hard care · 24–30 °C (75–86 °F)
- Pictus Catfish and Ocellaris Peacock Bass are both territorial and at least one is outright aggressive — expect serious fighting.
- Ocellaris Peacock Bass may bully the smaller Pictus Catfish, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Your 210 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
- Redtail Catfish⛔ Not recommendedAggressive · 120 cm · Hard care · 24–27 °C (75–81 °F)
- Two assertive fish, one genuinely aggressive: Pictus Catfish and Redtail Catfish will hold territory and clash.
- Redtail Catfish may bully the smaller Pictus Catfish, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Your 210 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
- Spotted Gar⛔ Not recommendedAggressive · 90 cm · Hard care · 18–26 °C (64–79 °F)
- Two assertive fish, one genuinely aggressive: Pictus Catfish and Spotted Gar will hold territory and clash.
- Spotted Gar may bully the smaller Pictus Catfish, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Your 210 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
- Wels Catfish⛔ Not recommendedAggressive · 300 cm · Hard care · 15–25 °C (59–77 °F)
- Two assertive fish, one genuinely aggressive: Pictus Catfish and Wels Catfish will hold territory and clash.
- Wels Catfish may bully the smaller Pictus Catfish, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Your 210 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
- Wolf Cichlid⛔ Not recommendedAggressive · 72 cm · Hard care · 24–30 °C (75–86 °F)
- Pictus Catfish and Wolf Cichlid are both territorial and at least one is outright aggressive — expect serious fighting.
- Wolf Cichlid may bully the smaller Pictus Catfish, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Your 210 L tank is below the ~760 L this pairing really wants — crowding raises aggression.
Compatibility is computed from each species' care data — a strong starting point, not a guarantee. Individual temperament varies, so always introduce new fish slowly and watch them.
Pictus Catfish care specs
- Care level
- Medium
- Breeding
- Very Hard
- Max size
- 12 cm (4.7 in)
- Min tank size
- 210 L (55.5 gal)
- Temperature
- 22–27 °C (72–81 °F)
- pH
- 6–7.5
- Hardness
- 5–15 dGH
- Lifespan
- 8–10 years
- Diet
- Carnivore
- Swim level
- Bottom
- Group size
- 3+ (shoaling)
- Family
- Pimelodidae
- Origin
- South America — upper Amazon basin, Colombia and Peru
What is a Pictus Catfish?
The pictus catfish (Pimelodus pictus) is one of the most arresting freshwater catfish you can keep — a torpedo-shaped fish dressed in polished silver with bold black spots scattered across its body and fins. Add trailing barbels that extend almost the length of the fish itself, a deeply forked tail built for speed, and eyes that give it a permanently alert expression, and you have a bottom-dweller that actually demands to be watched.
It belongs to the family Pimelodidae, the long-whiskered catfish, and unlike the sedentary pleco it is anything but a passive scavenger. Pictus cats are fast, active patrollers that cover the entire bottom and midwater of the tank in quick, darting bursts. Their semi-aggressive temperament and carnivore diet mean they are not suited to a community of small, delicate fish — but in the right setup, with the right companions, they are genuinely spectacular.
Care level is rated medium: the fish is not especially fragile, but the tank size requirement, the shoaling minimum, and the dietary compatibility questions make it unsuitable for a first aquarium.
Where do Pictus Catfish come from?
Pimelodus pictus is native to South America — specifically the upper Amazon basin, ranging through Colombia and Peru. In the wild it inhabits large river systems with moderate to strong current, sandy or fine-gravel substrates, and water that is soft to moderately hard and slightly acidic.
These rivers run warm and well-oxygenated, and the fish are accustomed to the structural complexity of submerged roots, driftwood tangles and leaf litter. They hunt at dusk and through the night, picking off smaller fish, invertebrates and organic debris. Understanding this origin sets the template for a successful captive setup: current, oxygen, hiding structure, dim periods, and tankmates large enough to defend themselves.
What size tank does a Pictus Catfish need?
The minimum is 210 litres (55 gal), and that is for a group of three — the absolute minimum group size for this shoaling species. A longer footprint matters more than height; these fish patrol horizontally, not vertically. A 120 cm (4 ft) tank is workable for a trio; for a group of five or six, a 150–180 cm (5–6 ft) tank is far more appropriate.
Filtration needs to be robust. Pictus cats produce a significant bioload, are sensitive to ammonia and nitrite, and come from well-oxygenated water — an oversized canister filter or a combined sump/canister setup with good surface agitation is ideal. Decorate with smooth driftwood, rounded river stones and PVC tubes or clay caves for daytime retreats. Avoid sharp rock or gravel with jagged edges: the long barbels are easily damaged and are a primary infection site.
What water parameters do Pictus Catfish need?
- Temperature: 22–27 °C (72–81 °F)
- pH: 6.0–7.5
- Hardness: 5–15 dGH
Soft to moderately hard, slightly acidic to neutral water mirrors their wild river habitat. They are more tolerant of harder water than many Amazon species, but very hard or alkaline conditions cause long-term stress. Ammonia and nitrite must be zero at all times — keep up with weekly water changes of 25–30 % and test regularly, especially in the first months after setup. Dissolved oxygen is important: add a powerhead or spray bar to create the gentle to moderate current these fish prefer.
What do Pictus Catfish eat?
Pictus catfish are carnivores and active, opportunistic feeders at night. In the aquarium they accept a varied diet:
- Sinking carnivore pellets — the staple; choose a high-protein formula
- Frozen bloodworms, tubifex and brine shrimp — excellent conditioning foods
- Frozen or thawed prawns/mussels — occasional treats for larger fish
- Live foods — accepted eagerly, but bring disease-introduction risk
Drop food at lights-out or shortly before, so it reaches the bottom before surface and mid-water fish intercept it. Spot-feed with tongs if necessary. Feed once daily in moderate amounts; overfeeding quickly degrades water quality in the large tanks these fish require.
Do not rely on them as scavengers to clean up after other fish — they are hunters, not cleaners.
Are Pictus Catfish aggressive — and what fish can live with them?
Pictus cats are rated semi-aggressive, and the aggression is almost entirely predatory in nature: they will eat any fish that fits in their mouth. Their mouths are wider than they appear in photographs, and small tetras, guppies, nano rasboras and similarly sized fish will disappear overnight. This is the single most important compatibility fact for this species.
Safe companions must be fish that cannot be swallowed — generally anything over roughly 6–8 cm (2.5–3 in) that is not itself dangerously aggressive:
- Larger barbs (tiger barbs, tinfoil barbs)
- Giant danios
- Medium-to-large South American cichlids (severum, blue acara) — avoid dwarf cichlids that are too small
- Other robust catfish of similar size (synodontis, larger plecos)
- Large rainbowfish
Avoid any fish with trailing, thread-like fins that could be mistaken for prey, as well as anything small enough to fit in the pictus cat’s mouth. Pictus cats are peaceful with each other when kept in a proper group.
For a full, filterable list of pairings, see Pictus Catfish tank mates.
How do you tell male and female Pictus Catfish apart?
Sexual dimorphism in this species is subtle and unreliable for aquarium purposes. Females are reportedly slightly deeper-bodied and fuller in the abdomen when mature and conditioned, particularly when gravid. Males tend to be slightly more slender. However, the difference is minor enough that confident visual sexing is not practical in the hobby — most keepers cannot reliably distinguish the sexes even with fish in hand.
If breeding is the goal, keeping a larger group of five or six fish and allowing natural pairing is the most realistic strategy.
How do Pictus Catfish breed?
Breeding Pimelodus pictus in captivity is rated very hard and is extremely rare. There are very few documented successful spawning events outside of commercial fish farms, which use hormone injections (a technique not available to hobbyists). The species is believed to be a free-spawning broadcast spawner in the wild, likely triggered by seasonal rainfall, flood-pulse conditions and significant temperature or pressure changes — conditions almost impossible to replicate in a home aquarium.
For hobbyists, the realistic approach is to keep a healthy, well-fed group in excellent water quality and stable conditions. Should spawning ever occur spontaneously, eggs would likely be scattered over a fine substrate or among plant roots and would need to be transferred immediately to a separate rearing tank, as adults will consume them. Consider this an aspirational project rather than a planned breeding goal.
What are common Pictus Catfish diseases?
Pictus catfish have no scales, which makes them more sensitive than scaled fish to certain pathogens and to harsh water conditions. The most common health problems are:
- Barbel erosion / bacterial infection — the long barbels are prone to bacterial rot if damaged by sharp substrate or decor, or if kept in poor water quality. Prevention: smooth substrate, rounded decor, pristine water.
- Ich (white spot disease) — the classic white-spot parasitic infection; scale-less catfish can be more severely affected than scaled fish. Prevention: quarantine all new fish, avoid sudden temperature drops, maintain stable conditions.
- Skin flukes and external parasites — more common when fish are stressed or newly imported. Prevention: a proper quarantine period of at least two to four weeks for all new arrivals.
- Ammonia / nitrite poisoning — manifests as lethargy, rapid gill movement and reddening. Prevention: never add these fish to an uncycled tank; test water regularly.
Health note: symptom descriptions here are for awareness, not diagnosis. Confirm any suspected disease against a reputable veterinary or fish-health reference before taking treatment steps.
How long do Pictus Catfish live?
With good care, pictus catfish live 8–10 years — a longer lifespan than many aquarists expect from a fish often impulse-bought as a “cool-looking catfish” at 5 cm (2 in). That long life is both a reward and a commitment: this fish will need a large, properly maintained tank for the better part of a decade.
The keys to reaching the upper end of that range are clean water, a stress-free environment with companions of appropriate size, a varied carnivore diet, and — critically — keeping the fish in a group of three or more from the start. Solitary pictus cats are chronically stressed and rarely reach their potential lifespan.
Frequently asked questions
Can pictus catfish live with small fish like neon tetras or guppies?
No — this is the most important warning for pictus catfish keepers. Despite being sold as 'community fish', pictus cats are opportunistic predators whose mouths are larger than they look. Neon tetras, guppies, small rasboras and similarly sized fish will eventually disappear at night. Safe tankmates are fish that are too large to swallow: larger barbs, medium cichlids, giant danios, and similarly sized catfish.
Why do pictus catfish need to be kept in a group?
Pimelodus pictus is a shoaling species — solitary individuals are permanently stressed, hide constantly, and often refuse food. A group of three or more brings them out into open water and triggers the fast, coordinated patrolling behaviour that makes them so eye-catching. Bear in mind that each fish grows to around 12 cm, so a proper group needs a tank of at least 210 litres with strong filtration.
What you need to keep a pictus catfish
The baseline is a heated, filtered 210 L+ tank: a reliable heater to hold 22–27 °C (72–81 °F), a gentle filter that won't batter a pictus catfish in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
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