Help to stop biting?

[reptiledude987]

The terrarium is 8'x3'x4' and hes around 3' head to tail. Hes got tons of space just got a real attitude problem. None the less I only go into his terrarium once a weak to clean and try to make it as stress free as possible. I'd say typically I only have to actually take him out once/ mth to do what needs to be done. When hes up on his big high branch hes fine with me going in (just puffs himself up a bit).