ummm maybe.... but these actually get rather large themselves... and would require target feeding as a result. They get to about 1' long, and when young they need to be in a school or they wont eat, and still do better in larger numbers as adults. Also their spines are toxic... I don't know if it would be a good idea to put them with sharks... Maybe a larger crab spiecies would be better? Something capable of picking up large meat scraps and the like?