Hartt's banjo catfish

Where they come from

Hartt's banjo catfish (Bunocephalus hartti) is one of those little South American oddballs that looks like a dead leaf with fins. They come from slow, warm freshwater areas where there is lots of sand, silt, and leaf litter. That background explains basically everything about them in the aquarium: they want soft bottoms, dim light, and food that lands on the substrate.

Setting up their tank

Think bottom-first. These fish do not care about your fancy midwater aquascape. Give them a soft substrate, shaded areas, and places to wedge into, and they will show up more and stress less.

• Tank size: 20 gallons is a comfortable starting point for one, bigger if you want a small group and more floor space
• Substrate: fine sand is my go-to; they like to bury and shuffle around
• Hardscape: driftwood, leaf litter (catappa/oak), and low caves so they can tuck in during the day
• Plants: anything that handles lower light works; floating plants help keep them relaxed
• Flow: gentle; they are not a high-current catfish
• Filtration: steady and quiet; sponge prefilters are great because they forage along the bottom

Lighting is a bigger deal than people think. If the tank is bright and bare, you will basically own an invisible fish. A darker setup with leaf litter and a couple of shady hideouts makes them far more likely to come out at feeding time.

What to feed them

They are bottom hunters and scavengers, but do not confuse that with eating leftovers. If the faster fish clean the tank in 30 seconds, your banjo may go hungry while looking perfectly fine.

• Sinking carnivore pellets or wafers (small enough for their mouth)
• Frozen foods: bloodworms, blackworms, daphnia, brine shrimp, chopped krill
• Live foods if you can: blackworms and small earthworm pieces work well

If you keep them with active tetras or rainbows, use a feeding tube or long tweezers to deliver food right to the bottom near their hide. That one change fixes a lot of mysterious weight loss.

How they behave and who they get along with

Banjo catfish are calm, mostly nocturnal, and masters of staying still. You will lose them in the sand and then suddenly notice a pair of eyes looking back at you. They are not aggressive, but they are still a catfish with a mouth that can fit small fish.

• Good tankmates: peaceful community fish that stay midwater (most tetras, rasboras, pencilfish), calm corydoras, small plecos
• Use caution: very tiny fish or shrimp (babies can disappear), super boisterous feeders that outcompete them
• Avoid: big cichlids, fin nippers, anything that will pick at a resting fish or flip them around

If you want more than one, it can work, but give them extra hides and feeding spots. They are not exactly social, more like tolerant roommates, and crowding them tends to make them even more secretive.

Breeding tips

Breeding Bunocephalus hartti in home aquariums is not something you will stumble into often. Most people never see it happen, and a lot of fish in the trade are wild-caught. That said, if you want to try, you need a mature, well-fed group, a quiet tank, and patience.

• Condition with meaty foods for a few weeks (frozen/live works best)
• Keep the tank dim with plenty of cover and soft substrate
• Try a seasonal cue: slightly cooler water change, then back to warmer temps over a few days
• Offer tight caves or leaf piles where eggs could be deposited and protected

Common problems to watch for

Most issues with this species come down to two things: they get beat to food, or they get kept on the wrong bottom. They are hardy once settled, but they do not bounce back fast if they have been starving quietly for weeks.

• Slow starvation: belly gets pinched in, fish gets more and more inactive (target feed at night)
• Scrapes and barbel wear from rough gravel (switch to sand and keep the bottom clean)
• Stress from bright lights and no cover (add floaters, wood, leaves, and shaded hides)
• Poor water quality around the substrate (vacuum lightly, do smaller regular water changes, avoid letting mulm turn foul)
• Medication sensitivity: like many catfish, they can react badly to harsh dosing (go gentle, increase aeration, research the med first)