Noticed today that my garter's skin seems to be pale-ish in color to what it normally was, almost a dirty appearance, and his skin wrinkles when he moves and seems to be flaking open. It looks very dry and have been scouring the net trying to find some sort of an answer. All I can dig up is that his cage is dirty. Is this possibly Vitamin E related maybe? He eats minnows, I do put Calcium and Vitamin B1 in the water. Any ideas?