I have a 40 gallon tank and reptisun 10.0 T5 that is probably about a foot away, temps in basking around 110-115 F with variability on cool end, above 65 F at night. Dust everything w calcium, about half the time with d3, sometimes with other vitamin mix. His beard has never turned black, but sometimes I notice underneath it seems to be turning a little black. Would it be full on black if something was wrong? I do notice he is sometimes darker than other times but sometimes I can't tell the why it would be. He has a varied diet (that has gotten MORE varied lately.. Maybe causing this?) of multiple greens (none of which he EVER eats) crickets, dubias, multiple types of worms (wax, super, bsl, the occasional horn worm) and some fruit which is about the only thing he's eating right now. He started out first completely denying anything vegetable whatsoever, then stopped chasing crickets as much as usual, then denied crickets completely, then only ate worms, then only ate treat worms like super worms, then started denying those completely and only is eating small bites of blueberry and strawberry. I know I probably shouldn't even offer treats when he's not eating but UGH don't want him to starve! Unless it's just brumation which I am very unfamiliar with.