Your better off using a pump with needle wheel or mesh impellar, utilizing air intake, via just a rubbe air line.
Thanks for the advice.
I've looked into all the many different designs.
I noticed the latest post on a DIY skimmer uses an air pump system. I prefer that since it simplifies the set up.
I'm building 60 inch column skimmer, starting with a 9 inch diameter PVC pipe that I picked up for free. It will work on a gravity system, with the skimmer taking water off the top of the aquarium and eventually emptying into the sump.
So far, I've only spent $30 and I have all the parts I need, except the air pump and 3/8 inch tubing.
I'll make my own airstone and see how that works.
I can always convert to water pump system with a venturi tube if the air pump doesn't work out.
The only part I have yet to buy is the air pump. I'll probably go with a $46 commercial air pump (1257 gph) from eBay.
However, I am open to other suggestions.
Joe