New Male not doin so good

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the discoloration is just on the base of his tale and it seems to be not spreading now, the last poo i saw was white and very runny like bird poo. he moves around and seems to be strong there is no was he would let me put him in a container he is still moving around drinking uper well but that does not seem to be helping, he is basking and then he goes down in the plants so he seems to be regulating himself. Those eyes keep going deeper i dont understand it.