What that is? It is everywhere, but especially it likes gorgonians. I clean poor animals at morning and evening and still they hardly find time to open polyps. All sand bed is also covered with that stuff. These hair grows 5 inch per day at some places.
Seems like I cant get rid of that.
I also have picture of sand bed if that will help.
N= 7 (usually is 0)
P= 0.00
Silicates =0
Cal =440
Alk = 8.2