We went on vacation and left the care of our rabbit in the hands of his sister- she did well,but never changed a potty. So for 3-4 weeks the booda dome potty was unchanged. I get back today and find mushrooms growing in it and some large stalk thing in the middle! I'm in a full blown panic here! WIll Bella be ok???? SHe is acting normal however. I have no way of knowing how long the fungi have been growing in there and if she went in there with it or not. The potty is one of those cat ones with a dome lid- it's her outside potty. Darker environment.