Celebes Rainbowfish tank mates
A nano rainbow with a hard-water requirement. Pair with rasboras and corys, not cardinals and discus. Stable parameters and a six-fish school for colour.
Lists below are built from this species record (safest, best with, risky, unsafe) — each link opens a pair-level check, not a guarantee.
Best tank mates (on file)
Merged from conservative safest and best with fields — de-duplicated by species.
The Celebes Rainbowfish profile lists Bristlenose Pleco as both safe and a recommended pairing. Bristlenose Pleco grows bigger than Celebes Rainbowfish (15cm vs 7cm). Stock the Celebes Rainbowfish group large enough to outnumber the Bristlenose Pleco, or the smaller fish ends up bullied or off food. Bristlenose Pleco swims in the bottom zone while Celebes Rainbowfish stays in the middle, so the two will not crowd the same water column.
The Celebes Rainbowfish 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 Celebes Rainbowfish stays in the middle, so the two will not crowd the same water column.
The Celebes Rainbowfish profile lists Harlequin Rasbora as both safe and a recommended pairing. Harlequin Rasbora schools in groups of 6 or more, so plan room for the whole group rather than one fish.
The Celebes Rainbowfish profile lists Otocinclus as both safe and a recommended pairing. Otocinclus schools in groups of 4 or more, so plan room for the whole group rather than one fish.
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.
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Fish to avoid with Celebes Rainbowfish
From the unsafe list — predation, aggression, or space rules on this profile.
Tiger Barb conflicts with Celebes Rainbowfish on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Oscar reaches 35cm and is flagged predatory. Celebes Rainbowfish at 7cm is prey-sized for it. Oscar needs at least 300L, far above the 80L minimum for Celebes Rainbowfish. The tank that houses one stresses the other. Oscar is rated aggressive and Celebes Rainbowfish is rated peaceful. No community-style planning carries that gap.
Common Pleco needs at least 600L, far above the 80L minimum for Celebes Rainbowfish. The tank that houses one stresses the other.
Discus needs at least 200L, far above the 80L minimum for Celebes Rainbowfish. The tank that houses one stresses the other.
Tank size and groups
- Published minimum for Celebes Rainbowfish: 80L — group minimum 6 (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: 80L hub.
Easier alternatives to consider
Conservative beginner-peaceful picks from the library — not replacements for reading, but a shorter on-ramp than this species for a first tank.
Plan before you buy
Pair checks for every mix, then multi-species stocking in the builder.
Filtration & heating
A 80L minimum tank for Celebes Rainbowfish needs a filter rated for at least 320L/hr turnover and a heater maintaining 22–28°C.
Similar fish (same category)
- Dwarf Neon Rainbowfish — min 100L
- Threadfin rainbowfish — min 60L
- Boesemani Rainbowfish — min 150L
- Turquoise / Lake Kutubu rainbowfish — min 200L