When i emptied my SW aquarium 10 plus years ago I had a piece of live rock that I placed on a shed behind my house. Since then I'm back into it and I really love the shape and character of this piece of rock. The only problem is it has been outside for years and has some moss growing on it. Is there a way to clean it and would it be safe to put back into my new aquarium? I know it would take a long time to become live rock again but my concerns are safety to my tank.