What fish can live with Upside-down Catfish?

Use the "Often compatible" lists as a shortlist, not a stocking plan. Always run the pair tool and check the footprint of your actual tank first. Verify behaviour for Upside-down Catfish against your own reading before you buy.

What tank mates should you avoid with Upside-down Catfish?

Avoid Oscar, Jack Dempsey, Betta based on size, temperament, or predation risk on file.

What size tank do Upside-down Catfish need for a community?

100L is the planning floor for adult swimming space and bioload headroom. Long-term, a 122L+ tank lets adults use the full footprint without crowding the next species. Footprint, meaning length and front-to-back depth, matters as much as raw volume for active or territorial species.

Upside-down Catfish tank mates

A small African catfish that swims inverted and hides by day. Needs its own kind and overhanging surface cover to display naturally.

Evidence: partially verified

Confidence: high

Lists below are built from this species record (safest, best with, risky, unsafe) — each link opens a pair-level check, not a guarantee.

← Full Upside-down Catfish profile·Compatibility checker·Tank builder·More catfish

Best tank mates (on file)

Merged from conservative safest and best with fields — de-duplicated by species.

Boesemani Rainbowfish Pair check
The Upside-down Catfish profile lists Boesemani Rainbowfish as both safe and a recommended pairing. Boesemani Rainbowfish schools in groups of 6 or more, so plan room for the whole group rather than one fish.
Congo Tetra Pair check
The Upside-down Catfish profile lists Congo Tetra as both safe and a recommended pairing. Congo Tetra schools in groups of 8 or more, so plan room for the whole group rather than one fish.
Corydoras Catfish Pair check
The Upside-down Catfish profile lists Corydoras Catfish as both safe and a recommended pairing. Corydoras Catfish schools in groups of 6 or more, so plan room for the whole group rather than one fish. Corydoras Catfish swims in the bottom zone while Upside-down Catfish stays in the middle, so the two will not crowd the same water column.
Dwarf Gourami Pair check
The Upside-down Catfish profile lists Dwarf Gourami as both safe and a recommended pairing. Dwarf Gourami is a peaceful beginner-care species with a 60L minimum. Run the pair checker for your specific tank before stocking.

Risky or situational

From risky tank mates and broad avoid with (excluding “unsafe” below). May work with species-only setups, more water, or mature systems — read the pair page.

None on file beyond the safe list.

Fish to avoid with Upside-down Catfish

From the unsafe list — predation, aggression, or space rules on this profile.

Oscar See why (pair)
Oscar reaches 35cm and is flagged predatory. Upside-down Catfish at 10cm is prey-sized for it. Oscar needs at least 300L, far above the 100L minimum for Upside-down Catfish. The tank that houses one stresses the other. Oscar is rated aggressive and Upside-down Catfish is rated peaceful. No community-style planning carries that gap.
Jack Dempsey See why (pair)
Jack Dempsey reaches 25cm and is flagged predatory. Upside-down Catfish at 10cm is prey-sized for it. Jack Dempsey is rated aggressive and Upside-down Catfish is rated peaceful. No community-style planning carries that gap.
Betta See why (pair)
Betta conflicts with Upside-down Catfish on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.

Tank size and groups

Published minimum for Upside-down Catfish: 100L — group minimum 4 (schooling).
Compatibility changes when the tank is too short for turning, too little for a real school, or too warm for one species and not the other — that is why pair checks include tank context, not only temperament.
Nearest litre hub to this minimum: 100L hub.

Plan before you buy

Pair checks for every mix, then multi-species stocking in the builder.

Open compatibility checker Tank builder

Filtration & heating

A 100L minimum tank for Upside-down Catfish needs a filter rated for at least 400L/hr turnover and a heater maintaining 24–28°C.

Filter buying guide →Heater buying guide →Beginner plants guide →