I have quite a few mushrooms in my 12gal nano, and once in a while I find one disloged from it's
LR and floating around freely. They seem perfectly healthy, open and no discoloration or anything. If I can get ahold of them, I just put them in a place with little current and they're fine. Are my hermits or shrimp or snails disloging them. It does seem to be the smaller ones, less than 1inch, that are are being disturbed.