Bicolor Blenny (Ecsenius bicolor)

Bicolor Blennies run a mood ring instead of a fixed color scheme — the same fish can flash between a dark-fronted, orange-tailed pattern and a nearly solid burnt-orange wash depending on stress, territory disputes, or apparently just how the day is going. Add in the habit of perching on a rock ledge and staring back at whoever's staring into the tank, and you get one of the more personable fish in the reef hobby.

Care level: Easy · Temperament: Peaceful · Max size: ~4" · Min tank: 30 gal · Diet: Herbivore, algae + herbivore pellets