i agree, in three weeks i had 4-6 apstasia. in 6 weeks i had 29 of them. i got two peppermint shrimp. within one day over half were eaten, literally picked the rock bare. by week 2 all were gone and have never returned. they breed like rabbits which in turn feeds your fish. theyre also asexual, any two will breed. mother nature at its finest. (i have them in saperate tanks now) REEF-ON!!!