well, in that case, I will let them hang for a while and see what happens. While I'm at it I should go ahead and ask this question. What i 1st thought was a tiny coral growing on the back of a LR, I now think it may be aptasia. The rock is small enough for me to remove from the tank so my question is, if there is any doubt should I take the rock out and remove what ever it is? and if so can i then put the rock back?