Pictus Catfish Care Guide: Complete Pimelodus pictus Manual

Pictus Catfish Care Guide: How to Keep Pimelodus pictus Healthy

The Pictus Catfish (Pimelodus pictus) is one of the most popular medium-sized catfish in the freshwater hobby — silver, spotted, lightning-fast, and constantly on the move. Native to the Amazon and Orinoco basins of South America, they bring energy and personality to community tanks of 55 gallons and up. But their schooling needs, predatory feeding behavior, sharp spines, and venomous pectoral fins make them a fish that rewards thoughtful keepers.

This guide from Tropical Treasures Wyo in Cheyenne, Wyoming covers everything you need: tank setup, water parameters, feeding, the all-important schooling requirement, and the tank mates that work (and the ones that get eaten).

Pictus Catfish Quick Care Sheet

• Scientific Name: Pimelodus pictus
• Common Names: Pictus Catfish, Spotted Pictus, Pictus Cat
• Origin: Amazon and Orinoco basins (Brazil, Colombia, Peru, Venezuela)
• Adult Size: 4–6 inches (occasionally 8")
• Lifespan: 5–8 years with good care
• Minimum Tank Size: 55 gallons for a school of 3+
• Temperament: Peaceful with similar-sized fish, predatory toward small fish
• Schooling: Keep in groups of 3 or more
• Temperature: 75–81°F (24–27°C)
• pH: 6.5–7.5
• Hardness: 5–15 dGH
• Diet: Omnivore (carnivore-leaning)
• Care Level: Easy to moderate

Shop the Spotted Pictus Catfish at Tropical Treasures Wyo.

Tank Size and Setup

Why 55 Gallons Minimum?

Pictus Catfish are extremely active swimmers. They spend much of the day swimming long laps across the tank, often as a tight school. A 55-gallon (48" footprint) is the absolute minimum to accommodate this schooling and active behavior. A 75-gallon or 90-gallon offers a much better quality of life for a school of 4–6 individuals.

Substrate

Use sand or smooth, rounded gravel. Pictus have delicate long barbels (the whisker-like sensory organs they use to taste and feel the substrate) that erode quickly on sharp gravel. Eroded barbels rarely grow back fully, reducing their ability to forage properly.

Decor

Provide a mix of swimming space and hides:

• Driftwood for visual barriers and shaded areas
• Smooth river rocks or large slate stones
• Caves, PVC tunnels, or terra cotta pots for daytime resting
• Open foreground for swimming laps

Plants

Pictus don't eat plants, but they do bulldoze through softer carpets and uproot anything not anchored. Hardy options include Anubias, Java Fern, large Amazon Swords, and floating plants. Browse the full live plant collection.

Filtration and Flow

Pictus love moderate-to-strong current that mimics their native rivers. Use a canister filter or oversized HOB sized for 2–3x the tank's volume. Aim a powerhead diagonally across the tank for a gentle circular current.

Lighting

Moderate to dim. Pictus are crepuscular — most active at dawn and dusk — and may hide under bright direct lighting. Floating plants help diffuse the light.

Water Parameters

Pictus are tropical fish from soft, slightly acidic Amazon rivers. They tolerate a wide range and adapt well to most freshwater conditions:

• Temperature: 75–81°F (78°F sweet spot)
• pH: 6.5–7.5
• Hardness: 5–15 dGH
• Ammonia/Nitrite: 0 ppm
• Nitrate: Under 30 ppm

Perform a 25–30% water change weekly. Always use a water conditioner to dechlorinate — catfish are sensitive to chlorine and chloramines.

Feeding Pictus Catfish

Pictus are opportunistic omnivores with a strong preference for protein. Feed a varied diet:

Staple Foods

• Sinking carnivore pellets — the daily staple.
• Hikari Cichlid Excel Sinking Mini Pellets work well due to their size.
• High-quality flake food (they'll grab it before it sinks).

Treats (2–3x weekly)

• Frozen bloodworms, brine shrimp, mysis shrimp
• Frozen krill or chopped shrimp
• Earthworms or blackworms
• Sinking algae wafers (for variety)

Feed once daily, in the evening when Pictus are most active. They are aggressive eaters and will outcompete slower tankmates — target-feed bottom dwellers like Corydoras or plecos on the opposite end of the tank. Browse the full fish food collection for more options.

Schooling: The Most Important Rule

Pictus Catfish must be kept in groups of 3 or more. A single Pictus is one of the most miserable fish in the hobby — it hides, refuses food, becomes strictly nocturnal, and often dies of stress within a year. A school of 4–6 brings out their best behavior: dawn-and-dusk chases across the tank, social interaction at the cave openings, and confident open-water swimming.

Tank-size recommendations by group size:

• 3 Pictus: 55 gallons minimum
• 4–5 Pictus: 75 gallons
• 6+ Pictus: 90 gallons or larger

Tank Mates for Pictus Catfish

The Pictus golden rule: if it fits in their mouth, they will eat it. Choose tank mates that are similar in size and fast enough to keep up. Larger South American cichlids like Severums pair well with adult Pictus — see our best tank mates for Severums guide.

Compatible Tank Mates

• Larger tetras: Black Phantom Tetras, Colombian Red & Blue Tetras
• Rainbowfish: Boesemani, Turquoise, Dwarf Neon
• Medium barbs (rosy, tiger, gold — in groups of 6+)
• Severums and Angelfish (in 75+ gallons)
• Silver Dollars
• Plecos and Synodontis catfish
• Large Corydoras like Sterbai or Trilineatus
• Larger gouramis (Pearl, Blue, Opaline)

Tank Mates to Avoid

• Small tetras (neon tetras, embers, chili rasboras) — considered dinner
• Guppies, Endlers, and fry — eaten
• Dwarf shrimp (Amano, Cherry, Ghost) — picked off at night
• Bettas — slow fins; wrong tank temperament
• Discus — too stressful
• Aggressive cichlids (Red Devils, Jack Dempseys, large Oscars)
• Goldfish — wrong temperature

For a deeper breakdown, read our companion guide: Best Pictus Catfish Tank Mates.

Behavior and Personality

Pictus Catfish are active, intelligent, and curious. Expect:

• Constant swimming patrols of the tank, often in tight school formation
• Peak activity at dawn and dusk
• Recognition of feeding times — they'll come to the front of the glass
• Frequent use of their long barbels to taste-test substrate and tank décor
• Resting in caves or under driftwood during midday

They are not aggressive toward similar-sized fish but are opportunistic predators — they hunt small fish that wander into open water at night.

A Word on Venomous Spines

Pictus Catfish have sharp pectoral and dorsal spines that deliver a mild venom. The sting is comparable to a wasp — painful for 30 minutes to a few hours but not medically dangerous to humans. To handle:

• Never use a net. The spines lock into mesh and break off, injuring the fish.
• Use a sturdy plastic container, cup, or bag to scoop the fish.
• If stung, soak the affected area in hot water (as hot as you can tolerate) to denature the venom.

Breeding Pictus Catfish

Pictus Catfish are rarely bred in home aquariums. They need specific environmental cues — changes in temperature, water chemistry, and flow rate that mimic seasonal Amazon flooding — to spawn. Most Pictus sold in the trade are wild-caught or commercially farmed.

Common Health Issues

Ich (White Spot Disease)

Common after transport. Pictus are scaleless and sensitive to many ich medications. Use half-dose treatments and avoid copper-based medications. Increase temperature to 82°F and treat with a scaleless-safe ich med.

Barbel Erosion

Caused by sharp substrate or poor water quality. Switch to sand and improve water changes. Severe erosion may not fully recover.

Loss of Color / Lethargy

Usually stress. Check that you have at least 3 Pictus, the tank is large enough, and water quality is optimal.

Frequently Asked Questions

How big do Pictus Catfish get?

Typically 4–6 inches. Exceptional individuals may reach 7–8 inches in very large tanks.

Can I keep just one Pictus Catfish?

No — they are obligate schoolers. A single Pictus hides, stops eating, and rarely lives a normal lifespan.

Are Pictus Catfish aggressive?

Toward similar-sized fish, no. Toward small fish and shrimp, they are opportunistic predators.

Do pictus catfish clean tanks?

While Pictus Catfish do sift through the substrate with their long barbels and consume some algae wafers, they are not efficient algae eaters or tank cleaners like plecos. Their diet is more carnivore-leaning, and they primarily scavenge for meaty foods rather than cleaning algae or detritus.

Do Pictus Catfish need a heater?

Yes — they are tropical and require 75–81°F.

Can Pictus live with shrimp?

No. Even adult Amano shrimp may be eaten at night.

How long do Pictus Catfish live?

5–8 years with good care. Some have been documented to 10+ years.

Are Pictus Catfish nocturnal?

They are crepuscular — most active at dawn and dusk. With a proper school, they are visible most of the day.

How many Pictus in a 75-gallon tank?

4–5 individuals is ideal. This leaves room for other tank mates without overcrowding.

Do Pictus Catfish eat plants?

No. They may uproot loose plants but won't eat them.

Are Pictus Catfish good for beginners?

Yes — with one caveat. They require a large enough tank and a proper school. If you can commit to a 55+ gallon for 3+ fish, they are an easy and rewarding species.

Visit Us in Cheyenne

Looking to build a Pictus Catfish school? Stop into Tropical Treasures Wyo in Cheyenne, Wyoming. We keep healthy, well-acclimated Pictus in stock and can help you build a compatible community of rainbowfish, larger tetras, peaceful cichlids, and plecos.

For more catfish, cichlid, and community-fish care guides, visit The Tank Buddy Blog.