I have tried a few things to try to rid my plants of the nasty black hair algae.... normally ended up throwing the plant out. I am trying a new product called Algaefix Pond care which is really for ponds, but you can use it for a tank, just have to use the tiniest amount. So far I am seeing some good results and am encouraged. I just wanted to share this because every now and again I read about yet another member who is plagued with this algae. I got it on-line.