i dun see the aiptasia? since they growing so near ur zoos. i dun suggest using chemicals. u can try digging it out. but make sure u dig the whole thing. leave one small piece behind, and it will grow into a new aiptasia. i dun suggest a nudibranch. i dun tink now have shipment, and when ur aiptasia gone, they will starve. dun get copperband coz they dun feed well, and they are quite troublesome to care for. MAY eat ur corals also. best is peppermint shrimps. get 2-3 so that the chances of getting them to eat it is higher