bacteria fuzzy

So I've had this white/brown slime stuff for over a year now. It started as a thin layer of almost slightly fuzzy white slime on the highest rock surface in my tank. Didn't seem much to worry about at the time. It got worse over time, and for the year this stuff has been covering every single...

Tank is 10 years old PO .09ppm always runs high NO3 0 NO3 2ppb Light 8 hours per day Tried :reef flux, algaefix, time waste away, UV unit, 7 day blabk outs. Corals snow with MB7. I tried no water changes for three weeks and then water changes every week. No luck. When I scrub it away. It's...