Your best bet at a biological control comes in the form of the inexpensive and easily kept red-legged or hairy hermit crab (Dardanus megistos). These small crabs are reef safe and normally one or two per infested aquarium is all that it takes to help control Aiptasia outbreaks. Remember that these crabs are small so don’t expect stellar results overnight. It will take the little hermits some time to start making a real impact against the Aiptasia. The peppermint shrimp (Lysmata wurdemanni) is another gallant warrior in the never ending fight against Aiptasia. These small shrimp (when kept in groups) can make quick work of an Aiptasia outbreak though are reported to occasionally nibble on coral polyps.