so alfy has been off feed for about a month or a little more now and today is the first day he has looked skinnier to me. his temps have dropped a bit and the cool side has been in the 70's, the warm side is about 85-90, but he always spends all his time on the cool- so i'm switching bulbs back to the higher wattage to get the temps back to norm and i will try to feed him again soon after. my question is, how much weight can be safely lost? is there a time to worry or is fasting through the winter completely okay?