Hmm, after looking at many other pictures of red slime algae, I don't think it is what I have. I don't have the "slimy part." In fact, I was kind of bummed when I thought it was bad stuff because it is very attractive, yet looks different from the red coralline algae that has started to fill in. There will be bubbles on it, then they go away in a few minutes, then they come back. In fact, I've got bubbles that come off the rock everywhere, even on the still-not-so-alive parts. I'm still very very new at this, so if anyone knows why I have small bubbles rising from my rock occasionally I'd love to know. Does it have to do with the lighting cycle as mentioned above? Sorry, I know this a bit off the topic of this thread. I'll post a picture tomorrow after the lights come on.