HELP!! I have tried everthing but I cannot get rid of my cyanobacteria problem. I've tested for phosphates (they are a little high), tried the erythromycin and blackout gig, increased water flow. I have a 92gal corner tank, moderately planted, pressurized CO2 and a regular fert regiment. Can anyone think of anything I haven't??? It's killing me...I've been doing water changes and gravel vacuuming about 3-4 times a week, which is getting really old. My substrate is from plantedaquarium.com that is really similar to eco-complete. Does anyone have any ideas?!?!?!? HELP!!!!