One of the free corals i got from the lfs
was a ricordia covered rock which has since died. I saw on one of them the day i got it some kind of growth that looked kinda like the back of a lettuce nudibranch? The next day or 2 it completely killed every ricordia but one little bitty one that i am hoping will live. I am just curious as to what it might have been? I have broken off the small corner that the little one is stuck to and moved it and boiled the rock to make sure that whatever it is doesnt spread to anything else.