gooey

Hi. This is my first post on reef2reef. I normally browse but never contribute. Iv just discovered a white substance which looks gooey behind some of my live rock. I spend quite a bit of time admiring my tank so I feel its appeared quite quick. Everything else in my tank seems fine. All my soft...

What is this, a ball of gooey that keeps coming once or twice a week? Random location, sometimes on the rock, on the sand below rock, on the sand in the open space, near zoas or not. Not necessarily at the dead spots, cause this one is still swaying and in the middle part of the rock. Is that...