Alright let me start off bye saying that Norbert has never been aggressive. Now Ever since i moved him to his new cage he randomly puffs out and twitches his head. My leopard geckos were in there but they got upgraded. So far its a 20 gallon long and hes 8 inches . He puffs out when ever my hands even near the glass. He takes off running when i put my hand in there. Hes tryed to bite me multiple times. Can anyone help me. My moms threating to get rid of him.