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green water vs CuSO4


Hi all!My tank is now full of green water. I've done blanket method for 3 1/2 days, but
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)