I had a mini-cycle in my tank originally and while I was gone on vacation a rock or two in the tank some some significant algae growth. Anyways, I plucked a lot off but in one part it's still a bit long and the other night I noticed my clownfish decided to sleep in a little indentation in the rock near all the algae. Today he is constantly rubbing in it and staying in that spot like clownfish do with anemones. Is it possible he thinks it's an anemone lol?