This is a sailfin tang. We saw it on Saturday at Petco while we were picking up our new gold Inca snails. One of the neat things about this fish is that he can put his fins up and down like sails. In this picture, his fins are up.
Sailfin tangs are saltwater fish. They live in the Indian Ocean and the South Pacific Ocean. The aquarium at my house is freshwater warmwater, but someday I hope we get a saltwater tank.
On the picture you can see some other fish in the next tank. But I don’t know what kind of fish they are. If you have any ideas on what the fish are, please leave a comment.