George, I didn't suggest tilapia here because the algae is free floating. Tilapia can and do filter feed, but not well enough to make a reasonable impact on a situation like this. To help control free floating algae like this takes about a 150-200 pound per acre stocking rate.
Rex,I am strongly "editing" this post.
Please accept my apology due to my misunderstanding of your "free floating algae" terminology. After closer examination of the photo, please allow me to "backtrack" on my statement.
Scary looking "stuff" that deserves surface aeration - not tilapia.
