Hey all, this algae has been growing in my tank for a few weeks now. I tried adding GFO about 10 days ago to see if that would help. The top rocks are where I took a toothbrush and scrubbed some of it off (it comes off easily in a dust cloud). Any ideas what it could be? The tank is about 4.5 months old
Nitrates-3
Phosphates-0
Nitrates-3
Phosphates-0
