Species Profile

Threadfin Rainbowfish

Iriatherina werneri

RainbowfishpeacefulLong-finned

Adult size

1.5″

Minimum tank

15 gal

Temperature

75–82°F

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.

Build a tank →Photo credits

Photo: Unknown / Wikimedia Commons · Source · CC-BY-SA-2.5