They eat smaller crustations potentially so we will see. Here's what live aquaria says
A 500 gallon or larger aquarium is required due to its size and eating habits. It grows at a rapid pace to almost three feet in length. It needs a larger tank to provide it with ample swimming room and plenty of hiding places. If placed in a reef aquarium, the Spotted Sweetlips will eat smaller crustaceans, smaller fireworms, serpent stars, small snails, and polychaete worms.