Triggerfish are digging coral for prey

Triggerfish are bottom dwellers that dig up prey, such as crabs and worms, by flapping debris with their fins and blasting sand with water sprayed from their mouths, which is pretty cool to watch. They also use their very hard teeth and jaws to catch sea urchins, turning them over to get to their stomachs, which are armed with fewer spines.
They wreak havoc on the less fortunate reef dwellers so that smaller fish often follow them to eat their leftovers