Its every new reefers mistake to put that DAMM DAMSEL in their tank. If u want the other fishes or new introduce fishes to live peacefully, remove them immediately even before adding new fishes. Hard to trap them as they are aggressive SMART, SMART , SMART. Dry the tank to get them out unless u have a big net with no LR inside......HUNT THEM BEFORE THEY HUNT YOU.....(Yr pocket)....Happy Hunting.....