I just recently read a post regarding that "Miserable" green thread algae (this is a desciption, not name). I have a 75 gallon aquarium with various plant types (ie. sword plants - rubin, reg. amazon, ozelot, pygmy chain, radican, rosetti and maybe a few others, val, tiger lotus, red lotus, anubias - coffefolia, nana, barteri, aponogeton - crispus and I believe that is the majority of the plants). They are planted in a 50/50 mix of clay based sustrate and reg. gravel, I fertilize via root tabs, the lighting is at just under 4 watts per gallon and is on for 14 to 16 hours daily, my water is soft to medium soft, all water changes are done with RO water and I do not use any method of CO2 injection. I use the Flourish excel instead. Having stated this, I too have been fighting the dreadful green hair algae and am sick of it, it covers my large sword plant leaves and forces me to continue to prune them back in attemps to alleviate it, ...................any ideas on how I may win this battle. Thanks!!!