What fish can live with Celestial Pearl Danio?

Strictly nano-tank companions: otocinclus, pygmy corydoras, chili rasboras, sparkling gouramis, dwarf shrimp in mature, heavily planted setups. Avoid all common community staples that would either out-compete them (tiger barbs, angelfish) or stress them out of feeding (bettas, larger danios).

What tank mates should you avoid with Celestial Pearl Danio?

Avoid Oscar, Tiger Barb, Angelfish, Betta based on size, temperament, or predation risk on file.

What size tank do Celestial Pearl Danio need for a community?

30L is the planning floor for adult swimming space and bioload headroom. Long-term, a 37L+ 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.

Celestial Pearl Danio tank mates

A 2.5 cm nano gem with spotted pattern and red fins. Peaceful in a careful community. Stress-intolerant in boisterous or overstocked setups.

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 Celestial Pearl Danio profile·Compatibility checker·Tank builder·More barb

Best tank mates (on file)

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

Chili Rasbora Pair check
The Celestial Pearl Danio profile lists Chili Rasbora as both safe and a recommended pairing. Chili Rasbora schools in groups of 8 or more, so plan room for the whole group rather than one fish.
Otocinclus Pair check
The Celestial Pearl Danio 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. Otocinclus grows bigger than Celestial Pearl Danio (5cm vs 2.5cm). Stock the Celestial Pearl Danio group large enough to outnumber the Otocinclus, or the smaller fish ends up bullied or off food.
Pygmy Corydoras Pair check
The Celestial Pearl Danio profile lists Pygmy Corydoras as both safe and a recommended pairing. Pygmy Corydoras schools in groups of 6 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.

None on file beyond the safe list.

Fish to avoid with Celestial Pearl Danio

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

Oscar See why (pair)
Oscar reaches 35cm and is flagged predatory. Celestial Pearl Danio at 2.5cm is prey-sized for it. Oscar needs at least 300L, far above the 30L minimum for Celestial Pearl Danio. The tank that houses one stresses the other. Oscar is rated aggressive and Celestial Pearl Danio is rated peaceful. No community-style planning carries that gap.
Tiger Barb See why (pair)
Tiger Barb needs at least 80L, far above the 30L minimum for Celestial Pearl Danio. The tank that houses one stresses the other.
Angelfish See why (pair)
Angelfish reaches 20cm and is flagged predatory. Celestial Pearl Danio at 2.5cm is prey-sized for it. Angelfish needs at least 150L, far above the 30L minimum for Celestial Pearl Danio. The tank that houses one stresses the other.
Betta See why (pair)
Betta conflicts with Celestial Pearl Danio 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 Celestial Pearl Danio: 30L — group minimum 8 (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: 30L 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.

Open compatibility checker Tank builder

Filtration & heating

A 30L minimum tank for Celestial Pearl Danio needs a filter rated for at least 120L/hr turnover and a heater maintaining 22–26°C.

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

Related (care + temperament)

Other species that list Celestial Pearl Danio

Reverse lookup: these profiles reference Celestial Pearl Danio under safe or “best with” lists.