Siamese Algae Eaters do indeed eat that algae. All my older leaves were infested with it too. I had to drive an hour to a Pet Store that had some SAE's. Best thing I have ever done. They didn't seem to like the older stuff, so I gave my plants a good pruning and it hasn't been back since. As soon as I stuck these guys in they were nibbling on the edges of all the leaves.
29 Gallon, 2x36 PC, 2x Hagen CO2, XP2.
Red Rubin Sword, Java Fern, Hygro, Val, Crypt Wen., E. tenn