Species Profile
Threadfin Rainbowfish
Iriatherina werneri
RainbowfishpeacefulLong-finned
Adult size
1.5″
Minimum tank
15 gal
Temperature
75–82°F
pH
5.5–7.5
Schooling
Group of 6+
Water level
mid
Diet
Micro pellets, baby brine shrimp
Notes
Long thread-like trailing fins on males, used in courtship displays. Slow eater, easily outcompeted at feeding time by faster fish like danios. Best in a quiet planted tank with similarly gentle nano tankmates.
Compatible Tankmates
Best tank mates for Threadfin Rainbowfish
Every species below passes the compatibility engine when paired with Threadfin Rainbowfishin a suitably sized tank. Verdicts come from the same rules the builder uses — click a card to see that species' own care profile and its tank mates in turn.
Neon Tetra
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Cardinal Tetra
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Rummynose Tetra
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Harlequin Rasbora
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Celestial Pearl Danio
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Fancy Guppy
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Endler's Livebearer
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Platy
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Male Betta
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Dwarf Gourami
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Honey Gourami
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
German Blue Ram
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Photo: Unknown / Wikimedia Commons · Source · CC-BY-SA-2.5