I agree Peppermint Shrimp. My experience was limited to a Kenya Tree coral that had one aptasia. It was one coral/rock that had the infestation. My LFS took the coral/rock - Put it in with their Peppermint shrimp - 5 Minutes later - no aptasia problem. Contact your vendor and about the Live Guarentee - should fix you up. Be aware of what you would be putting the peppermint shrimp into (I don't know what is in your tank).