They have much better eyesight than humans. let him see you and get comfortable with you. If all you do is try to take him out, he'll know and probably pop you one good. Feed him, let him get cool. If you put a little feeder fish in there, he will go after it and many times swim off the rocks to get it. This would be a perfect time to get him, but they move super fast, so have the net ready. I feed mine freshwater feeders(I know, salt would be better, but) just to keep that natural instinct going. The feeders do not die for a while, so he has time to catch them before they start decomposing.