Ive got this threespot damsel in my tank,I need to get this devil out of my tank,he is the most aggressive fish Ive ever seen.he runs the tank,chasing everything he sees.Whats the best way to catch him without taking out all the rock in tank?Ive thought about making a little trap for him,but how long is it going to take to catch his a$$? he is a smart little fish too.any thoughts on this would be greatly appreciated thanx