Another Flatworm topic

[skabooya]

Yup, got flatworms in my 29 now. LOTS! I have read on how to get rid of them and I would like to do it biologically. BUT here is the thing... I have amazing life on my rocks and I would like to keep it. Shrimp are breeding, snails, crabs, pods of all sizes. What can I get that will fit my 29 and not destroy my teeny shrimp, snails, crabs and starfish. I have no fish currently... yet.