I have some hair algae not too bad but annoying nonetheless. Mostly appears on my back wall, and several pieces of rock, gravel and a film appears on my glass even 1 day after i clean it. I am using RO water which my TDS meter reads at 2ppm and I have a DI filter showing up to add to my unit hoping it will bring it down to 0ppm. I am now running Rowaphos in a phosban 150 reactor (twice the recommended about 4-5 inches worth. it looks nice and fluidized. This is my second batch of rowaphos. 1st batch ran for 3 weeks with no effect, this 2nd batch has been running for a week and the algae is growing as strong as ever. Not sure what to do. All water params are spot on, my total water volume is about 70 gallons max.