I have gone through about 4 clown fish in my nano. It is the strangest thing, they would just vanish, one day here next day gone no where to be found. So I was just sitting up playing some late night ps3 and my tank lights went off so I went over to see how my last clown fish was doing and he was no where to be found. So I look up at one of my fuzzy mushrooms and he is all closed up, so I watch it for a while and all along comes my emerald crab, goes up to the mushroom and pulls out my final DEAD clown fish. I could not believe my eyes then he went to town on it. Anyone know how to kill fuzzy mushrooms, cause they are costing me a lot of money in clown fish. Thought I would pass this story along cause I have finally figured it out, and was wondering if anyone else has had this issue.