I've had mine since late August, early September, and he is still pissy. So much so that we dubbed him "fat bastard." He is a nice boy and likes to eat, but has an additude. Now, I have a roommate and friends who like to party at my apartment when I'm not there, and I think that they tease the old boy. I've found thinks like gold fish crackers in is tank...it ticks me off! I can't wait for him to move out, but he swears that no one teases him...yeah right, drunk folks don't want to cause trouble. Anyway, I hope that mine settles down when my roommate leaves. If you continue to work with them, they will be fine. Remember, you are much bigger...kind of like a predator would be. You might want to try baiting them with a piece of their greens and/or a cricket/mealworm. Oh, mine doesn't really might, he just flattens and pokes his beard out, hisses, occasionally flips around with his tail, and gaps, holds his mouth open...th usual defensive, pissy mechanisms of a beardie.