> Hi all!My tank is now full of green water. I've done blanket method for 3 1/2 days, but nochange. Yesterday I caught some daphnias from a pond. Recently I've heard that 0.1-0.5ppm of CuSO4 can be a solution. I'm not sure if it means exactly CuSO4 or CuSO4+5H2O. Has anyone ever tried it? and do you think it makes a sence? ======================= Hong, Sungmin (S.Korea) =======================