After extensive research on getting rid of flatworms (the harmless kind) I've decided to not go with chemicals since it isn't necessary. I plan on getting a blue star leopard wrasse when I find one but in the mean time I have read the blue velvet nudibranch only eat flatworms. Saltwaterfish.com is selling them for $10 each too. Anyone have any experience with these in a high flow sps tank? It sounds like flow isn't too good for them.