[tang daddy]

Get a proper fish trap and let it sit in your tank for a few days even a week keep throwing shrimp tied to a large Coral base so fish can only eat inside, let everyone go in and eat, once he sees all the fish go in and out eating and he is just sitting outside he will go in. Let him go in and eat all the time then bam game over!

It isn't hard, I've caught many fish that way, eventually they all submit, you are smarter than your fish.... I have also have a fish trap!