The highest point will grow a lot of algae, but overall, it's not enough to really do anything unless it's in like a 10 gallon. It works better when it's out of water, but has water running over it in direct light.
It's in a 55g under an 80 watt 5000k CFL. I'll probably just ditch it if it doesn't grow anything in a week. I was expecting the wet-dry bit of it to be the most viable. Perhaps a little redesign with it covering more surface would be in order.
Oh, heck. Imma jus chuck some water lettuce in there and be done with it already.