Well the shop I got him from (who do have a good reputation) informed me that from when I got him (7 weeks old) till he was 6 months or over they recommended the small tank I have and just using a heat pad with thermometer attached with that, he's been fine for the four months I've had him, is sprayed with cool water around every 4 days just too keep humidity levels up, although recently I tried him on frozen mice from a different shop, he ate the first two I fed him and hasn't ate since (they are slightly bigger than previous mice I had, but not by a great deal), could the way they were killed possibly be the effect? thanks guys.