I still have this stuff been running carbon since the Mannings suggested Flow has no effect on it,it grows in the most flow area in front of tank. Where there is little flow it does not grow.I bought a used tds meter yesterday. It shows my water from the lfs is 76 tds Not going to say wich one.I have been using it for top off and salt mix. Will this be my problem. I'm getting green hair algae now also. I wonder how long thier tds has been this way?