Hi all. I’m hoping for some help with a fairly new tank. It was set up before Christmas so had been running around 6 months now. A few months ago a brown algae type substance started to develop. I just don’t know what it is so I’m unsure what action to take. I’ve just treated the tank with chemi clean which made absolutely no difference at all Based on that I’m assuming it’s not cyano? Is it brown algae, diatoms, dinos? Any help would be greatly appreciated. Nitrates and phosphates are 0 despite heavier feeding. Is it possible that the brown algae is using up the nitrates and phosphates giving the 0 readings? Thanks in advance! Peter