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It's a male Cetoscarus bicolor. The juveniles are often offered for sale, but it is one of the larger parrotfish species (reaching nearly 3 feet long).
Bicolor Parrotfish Cetoscarus bicolor
Bicolor parrotfish sleep in slimy bubbles. Before going to sleep in a reef hole, this parrotfish spins a cocoon around its body. The slimy bubble hides the fish’s scent. This protects the parrotfish from nighttime predators like moray eels, which hunt by their sense of smell.