1979camaro, there is some round red bubble like things in the center of the pic, kinda hard to see but i assumed they were corals. maybe not. I'm still pretty new to salt, but they don't look like algae to me. to the right of the duster. I'll see if i can't get a better pic for an i.d. and thanks to everyone in this site, it's nice to know there is someone out there to help us rookies out.