Because algae eats up Nitrogen and Phosphorus compounds, those levels often test within normal limits. I wouldn't bother testing, but if you do, don't be surprised that they are okay.
Look in the Reefkeeping Tips thread below for the links to excellent discussions about Eliminating Cyanobacteria and nuisance algae.
http://utahreefs.com/forum/forum_posts.asp?TID=9244Come back here if you still have trouble. Algae control is one of my specialties. A pic is always very helpful. Feel free to send a pic to 808-345-1049 or to
[email protected]Aloha