Doei it look like this???
If so, I found rams horn snails mow this stuff. If you can tollerate the snails you will have it dissapear after a few weeks.
I avoid adding chemicals etc to my tank at all, and prefer to find out some natural ways to rid of algae.
The only algae Ive used chems on was Cyno, and thats not really an algae, but rather a photosynthesizing bacteria.
Check out this link for som excellent algae ID pics and descriptions, it also tells of common causes and preventions.
http://www.aquariumalgae.blogspot.com/
Scroll down the page for pis etc
HTH