Arrgh. If it's not one thing, it's the other, right?
My tank (180, 4x 250 14k, MRC-2R skimmer) is (still) being overrun by green hair algae. On the rocks, on the sand, corals, snail shells, back glass wall, etc...
My tank parameters are fine. (Calcium Hardness is a bit low, but I'm working on...