if they have mold there either not venting it enough or there just not cleaning there cages like they should. Ap are great cages. Mark at boamaster makes some great cages to and his new line is alot like ap. Im not a fan of his older style wooden cages just because I had to help a freind move a 6 foot one up a flight of stairs and thought I was going to die lol. Those cages are heavy as can be. And I tend to rearrange cages every so often lol so I like light weight things lol