close to giving up now. Tanks still covered in green water despite all attempts to remove it. Iv tried: 30% water change daily, Tetra Algumin (started as of 11/11/13) Reducing the lighting to just 1 x 24w PL lamp over 48litres Blackouts - 3 day one and a 2 day one with water changes before and after the blackout increasing the Co2 so i have a yellow drop checker reduced feeding on the fish Cleaned all the parts i can physically remove from the tank IT just wont shift. It doesnt even show signs of getting better it just appears to grow back just as fast as i remove it and also just stays at the same level. The only thing i havnt tried is a U.V clarifier and im a little reluctant to go out and buy one to find it wont work. Before i reduced the lighting i had 0ppm phosphates now after reducing it to 1 24w PL i have high phosphates (5ppm) The plant growth has slowed right down and one of them is losing its leaves daily im forever picking them out the tank. This is probably due to the lack of light been able to penetrate the water. So the last and final thing im going to try before i rip the whole tank apart is to have my pump on the aeration setting blowing air bubbles into the tank for the entire week that im off. This means i wont be dosing any ferts. The Co2 in this time will be low no doubt due to the surface agitation. I might even take a couple of fish out the tank just to try reduce the load on the filters even though im running two. Im lost for things to try unless anyone else has any ideas.