Sounds exactly like cyanobacteria. You should try and feel for the texture of it. If it's slimy, then its definitely cyano
. This stuff is bad from what i've heard, but unfortunately, i'm not in any way sure as how to get rid of it.
Does it look like this??^^
If so.. then you've got yourself some cyano
. I believe cerith snails eat cyano
, but it's one of those hit or miss things, that isn't guaranteed to work. I also hear that more flow to that area will also help. Water changes should help also. Elimination of excess nutrients as well will greatly reduce cyano
. Use good algae like macro/chaeto that will use up all of the excess nutrients for you. Do you have a refugium or sump?
I'm trying to do some research for you, and the best thing that i have come up with is doing Water Changes to get rid of excess nutrients, and chaeto. I've seen multiple instances of people having terrible cyano
, and then getting chaeto and it disappearing like it was never there in the first place. I would go with the chaeto on this one buddy.