Good luck, I have a mostly full grown Sgt. Major Damsel which has been in my tank since 2004. I've managed to trap and/or net every other fish and critter in the tank except that damsel. He terrorizes my tank and any new fish that I put in, I know that he caused my African Midas Blenny to go carpet surfing. I'm resolved that the damsel will be in the tank until I get around to upgrading my tank and can get him out of there.