Aggressive fish are easier to get into a trap. Steal your wife or GF makeup mirror and tape it outside the glass near the trap. Once he goes to war with himself, move it slightly into the trap. once he starts going in to get at him self. Move it deeper into the trap reflecting in from the outside glass. I've trapped mean fish like this. They are usually so agro trying to kill their reflection they don't even notice the door close.
Good luck!