Hi,\n\nI'm about 12 months into my tank and have recently seen a Cyanobacteria outbreak occur. I'm fairly sure it is Cyano... I clean the back of the glass weekly but now there is a brown algae build up that when I wipe it off it appears like a brown gooey type substance. There is a small bit on the sand but the glass is getting a lot of it. For some reason it doesn't appear really on rocks or coral. My phosphates are at about 0.06 and my nitrates are at about 0.8. My nitrates were at zero so I have been dosing small amounts of nitrates daily to bring it up slightly. \n\nWhy would a Cyano outbreak occur when Phosphates and Nitrates are are as they are? I heard it could be Glucose in the water. Has anyone else heard of this or how I can test for this?\n\nThanks!