Title says it all. I keep having algae grow on the plant leaves, and I'm not really sure how to get it off. It's either dark dark green algae on the leaves or the wonderful thread algae tangled up in everything. Tank is 20 gallon, 45 watts of light (NO), I add flourish iron, potassium, and excel every water change. Plants are a survivor crypt, tons of java fern and bolbitis (stuff keeps growing), hygrophila, some amazon swords, 1 aponogeton (sp?), and some myphrobilium (i forget the exact name, something like that). The thread algae is especially bad since it clogs the filter and tangles the plants up. Any ideas? Thanks. 