He is looking a little off colour but I imagine once he's settled in and nicely fed up in a couple weeks' time he'll colour up just fine. In relation to his shape, yep, he's got a birth defect I'm afraid. I've noticed one of mine (Tiny Tim) who I recently got with a group from someone emptying their tank locally, has a twisted spine as well. He is much smaller than the others (but they are nearly all juveniles) and quite timid but I'm hoping that he'll be able to live a relatively normal life!