Mandarin Dragonet (Synchiropus splendidus) (Pair)

Mandarin Dragonets are one of only two vertebrate lineages known to generate true blue coloration with cellular pigment instead of light-reflecting structures — most animals fake blue with physics, these fish just make the pigment outright. That psychedelic paint job also signals a genuinely unpleasant mucus coating, which is most of why almost nothing bothers them despite having no scales to speak of. The catch: they graze on live copepods nearly non-stop and starve quietly in tanks without an established pod population, so this pair needs a mature system, not a new one.

Care level: Difficult · Temperament: Peaceful · Max size: ~3" · Min tank: 30 gal, mature with established pod population · Diet: Carnivore, live copepods/amphipods