Thanks for your help, Tess. I read the piece you recommended. I increased the daytime temp in the terrarium. Nite was already OK. I had recently put in fresh UVA and UVB lamps. I dug up some earthworms (his favorite food which is difficult to find in winter) and he went at them like a hunter. So far so good. BTW, since he started eating earthworms six months ago, he doesnt want to eat much of anything else. I'm concerned about him getting a balanced diet.