from what I read on aft's and their care they seem to pick a spot to do their business and it that's there spot . well my aft decided his corner will be his moist hide is this ok ?
He may like the spot or he may like having an "outhouse". If it bothers you, move the humid hide and put an outhouse (i.e. another hide) in the poop spot. That will maximize the chances that he'll go in the new hide instead of the old humid hide.