Planted Tank Enthusiast
Join Date: Jul 2013
Location: Worthington, MA
Why not actually try a total black out? Has worked for me, and many others...
Or you could try the willow branch trick. Cut off a willow tree branch, stick the cut end into the tank, and it'll suck up nutrients and starve the green water.
Or there's always the more expensive route of buying a UV sterilizer.