velocities are a diamond in the rough. keep an eye on all the different forums and jump as soon as you see one. you will prolly want the t-4 model to get 1000 GPH.
Geoff: can you confirm the size/model?
you cab fit a piece of eggcrate into the opening of the durso. or you could build a small overflow box to protect the intake which will actutally help with
surface skimming in a major way.
also, you could turn the elbow that would normally point down: turn it up to skimm the surface of the water.
do some searches in this forum along with RC to get some ideas to help surface skimming.
BR