I was at my lfs today and saw a "moss ball" It is the first one I had seen so I decided I would give it a try in one of my tanks. I got it home and did some research. I don't think its a moss ball, well at least not the type I thought it was. Here are some pictures. it is held down with a weight, and will float if not anchored. What is this exactly? I don't know if I should keep it here or move it to a different tank. Thanks for the help