I have a rock with 10 or so Green tongas and lately they have been a brown color and not the fuzzy geen they normally were. They have not changed in size or anything just more brown. I also have a few other mushrooms (all different colors and kinds) in my tank that are smaller than normal. Everything else in my tank is fine though, just seems to ba a mushroom problem. I tested my water and everything is normal. Anyone have any ideas what is going on?