Minerim banjo catfish

Where they come from

Minerim banjo catfish (Bunocephalus minerim) are one of those South American oddballs that look like a dead leaf with whiskers. They come from slow, warm freshwater areas where the bottom is soft and messy - sand, leaf litter, little sticks, that sort of vibe.

That background explains basically everything about how they live in an aquarium: they want to disappear into the substrate, move around mostly at night, and let food come to them.

Setting up their tank

If you set up the tank for how they actually behave (bury, hide, and patrol the bottom after lights-out), they are easy to keep. If you set up a bright, bare-bottom community tank and expect to see them all day, you will think you bought a rock that occasionally teleports.

• Tank size: I would start at 20 gallons long for one, bigger if you want a small group or a busy community.
• Substrate: fine sand is my go-to. They like to shimmy under it, and rough gravel can wear their belly and barbels over time.
• Hardscape: piles of leaf litter, small pieces of driftwood, and a few caves or half logs. Think low and cluttered, not tall and open.
• Plants: anything hardy works, but floating plants help dim the tank. They do not care about pretty stems, they care about shade.
• Flow and filtration: moderate is fine, but aim the outflow so the bottom is not getting blasted. They are a slow-water fish.

Water-wise, they are pretty forgiving as long as it is clean and stable. Warm tropical temps, neutral-ish pH, and low to moderate hardness are the usual sweet spot. The bigger thing is oxygen and cleanliness at the bottom, because that is where they live.

What to feed them

They are not algae eaters and they are not great at competing at feeding time. In my tanks, they do best when I feed the community normally, then come back after lights dim and target the bottom.

• Frozen foods: bloodworms, blackworms, brine shrimp, mysis, chopped krill (go easy on messy foods).
• Sinking prepared foods: quality sinking carnivore pellets, wafers that actually sink fast, and small catfish tablets.
• Live foods (treat): blackworms, live bloodworms, small earthworm pieces.

Portion control matters because they eat slowly and leftovers disappear into the sand and leaf litter. I would rather feed small amounts more often than dump a big meal that rots in the substrate.

How they behave and who they get along with

These are mellow little ambush-predator types. Most of the day they are buried with just the eyes and barbels showing, then they cruise the bottom once the tank calms down.

They are peaceful with fish that will not bother them, but they will eat what they can fit in their mouth. Tiny shrimp and very small fish can go missing, especially at night.

• Good tankmates: calm tetras, rasboras, hatchetfish, small to medium peaceful cichlids that are not bottom-bullies, pencilfish, peaceful dwarf cichlids with enough floor space.
• Use caution with: shrimp (especially juveniles), nano fish, slow bottom fish that want the same hiding spots.
• Avoid: aggressive cichlids, big boisterous barbs, fin-nippers, and any catfish that will outcompete them hard for food.

Breeding tips

Breeding banjo catfish in home aquariums is not super common, and I would call it a project rather than something that just happens. They are secretive, and even if you get spawning, raising fry is its own challenge.

• Start with a group so you have a real shot at both sexes.
• Give them a mature, heavily furnished bottom: sand, leaf litter, roots, and tight hides.
• Condition with meaty foods for a few weeks.
• A big cool-ish water change and a bump in oxygenation can help mimic rainy season conditions.

Common problems to watch for

Most issues I see with banjos come from the tank being too clean-looking and too bright, or from them slowly starving in a busy community because faster fish get everything first.

• Not eating enough: they hide, food gets stolen, and you only notice when the fish looks thin. Night feeding fixes most of this.
• Barbel/belly wear: usually from sharp gravel or a dirty, abrasive bottom. Switch to sand and keep the bottom from turning into a waste trap.
• Bloat/constipation: often from overdoing dry foods. Mix in frozen/live, feed smaller portions, and skip a day if they look swollen.
• Poor water at the bottom: mulm buildup under decor and leaf piles can cause stress. Spot-clean and move a piece of wood now and then, but do not tear the whole tank apart weekly.

If you keep the bottom soft, the lighting a bit subdued, and you make a habit of feeding after dark, Minerim banjo catfish are one of those weird, underrated fish that quietly do great for years.