Yellow Head Wrasse (Halichoeres garnoti)

Yellowhead Wrasses go through a dramatic color overhaul between life stages — juveniles and initial-phase fish wear a solid yellow head fading into a blue-black body, while terminal males shift toward a different pattern entirely as they mature and take over territory. At the first sign of trouble it dives straight into the sand, popping back up once the danger's passed.

Care level: Easy · Temperament: Peaceful · Max size: ~5" · Min tank: 30 gal, sand bed required · Diet: Carnivore, meaty foods