is it way bigger than him?if so he is prolly scared of it. do you think you can take care of him in your apartment? i mean joey and chandler raised "duck" and "chick" in a NY apt on the show "Friends", but that was TV. this is real life. i glad you gave him a second chance. So do your best...
Buy a tote..bigger than this 1 with a lid. Cut a square on the lid(not huge but big enough some won't suffocate. and find a way to hang a light. Get the lil 1 a stuffed animal so maybe he will think he's not alone.