Hi mine is a sweety and never shown any signs of aggression. I have had him over a year and half. I left him to settle for 2 weeks without bothering him much. I then just sat by his tank so he could see me for 4 days then I started talking softly to him, he now turns to look at me, I can stroke him, I whistle n he calls/sings. I feed him at 8pm each night so he gets into routine. I never take him out when I change him out , I remove soil around him, you can use cardboard to put in front of them at first. I then put new soil in and ease him over while I do where he was sat. They are great as long as you give them that secure feeling by not fussing them too much.