Parrotfish are most notorious for their behavior of chewing on live rock and corals while they look for food. While they are seldom attacking the coral itself, they can damage live corals and reefs while they grind the live rock in an effort to scrape off the encrusting algae and inverts that they are actually targetting. It is thought by some that parrotfish contribute to the creation of much of the coral sand in reef areas of the ocean!