The sea slug
New member
At the store, I got a tiny piece of broken-off coral with my purchase, it was just in the bag-and I can't remember if they said what it was or if it was just an accident. Now it's bleaching, and since I can't figure out what it is, I don't know what to do to help it. It was red and hard and flat, and was broken off, as far as I can tell, from a larger disk. Now it's white and actually has a little algae on it. Any ideas what it is and if I can fix it?