I'm not familiar with that type of algae, but I had a serious problem with black 'tuft', I guess you could call it, algae. It's like little bushes of black algae that grow on everything in the tank, need a knife to cut off pretty much, my plec doesn't touch it, and it's pretty immune to common chemicals used for alge control. I went in and saw graham from the hutt pet centre, and he recommended changing the pH of the tank. He gave me a pond algae block that you just drop into the tank. Over the course of a couple of weeks the block cleared up the black algae, and has visually eliminated green algae. There has been a change in the ph of the tank, but not a huge change. It's pretty much gone from slightly acidic to neutral.