I have very high nitrate and phosphate in my 90 gallons tank, vodka dosing it for a while now, followed the instructions for vodka dosing. Nitrate is under control, but phosphate still high, can easily go to above 0.5 if not run a lot of rowaphos. I start using phosphate Rx, it help reduce phosphate very quick, less than 0.2 and can reduce even more with more phosphate Rx. But, I have this new brown/white stringy slime building up in low flow area. Is that because i dose too much phosphate Rx and my skimmer is not removing the bi-product that phosphate Rx generated? Do anyone having this problem? Thanks