I was thinking it was cyano but its brownish and I haven't seen any gas bubbles trapped in it. I've had the red slime cyanobacteria outbreaks before but it was always red. Any ideas? Maybe an algae of some sort? Eitherway I don't like it!
I did recently add some dry clean pieces of lace rock to my tank. Could this cause it maybe?
I did recently add some dry clean pieces of lace rock to my tank. Could this cause it maybe?