A reef safe fish is one that can be introduced into a saltwater aquarium without fear that it will destroy coral, or any species of reef safe fish or marine life that also inhabits the aquarium. Angelfish are of a special interest in that they are a beautiful and popular addition to a saltwater aquarium.Some species of Angelfish can be considered to be reef safe fish while other species are not. Larger Angelfish sometime eat at the corral and are aggressive towards smaller fish in the tank, while as a rule of thumb, the smaller species of Angelfish are more apt to be reef safe fish, although there are of course exceptions. At one extreme is the Emperor Angelfish which eats, coral, shrimp, and sometimes other fish.