This may be a stupid question, but my live rock has small brown mounds all over it with a little dimple in each one. They almost look like a tiny volcano. I was just curious what they are from, so if someone asks me, I can sound smart. Thanks.
Its tough to say without a picture, post one and you may get some responses. I would say it could be some type of algae, but post a picture so we can see it.
sweet! looks like you got some species of mushrooms (i think). Don't worry they aren't a problem if they are mushrooms. I had a rock for over a year and then one popped up.