Thank you for your replies. I have been using a hook to tap him before picking him up but he still gets very aggressive. I got him out today, and although he was still very aggressive in his tank, he did calm down and he was very docile. He refused to eat which is concerning as well. So I have scheduled an appointment for him with the vet in the morning. At least she can look at his eyes and do a check up to see if there is something wrong that I am missing.