JP,
Surface skimming does work pretty well. Don't expect if you install one to have it all clean overnight. I'd think you would need to run it quite often (or all the time) - and especially when the wind is favoring where you have it set up.
You'll still have a little watermeal hanging out, and it will probably get clogged with sticks, etc so you will have to watch it...but it will do a good job at getting the majority of it. As an added bonus, this harvest method is removing the nutrients from the water.
