Hello! I'm new to R2R but have been reefing for 10 months now. I notice the other night while flashlight watching my night crew this thin yellow thing in an area that I could barely see, let along touch. During that time it just disappeared slowly. I found it again tonight and I've never seen anything like it before but I'm also still new. It's very thin, possibly 2 mouth and it moves around. Kinda looks like a yellow ravioli. Can someone help?