Okay how come eveyone one said that cyno and hair come from over feeding/ to much nutient in the tank. Well I have tested with the test kits at work and the my own test kits. It always comes up nitrite 0 nitrates 0 amm 0 Ph 8.43. So where is the problem I have MH that are 2 250 watt mogel with 2 110 watt VHO antinics. There is a lot of flow in the tank. I don't understand it. :? 8O :x. Help please