I think I may have found a way to accomplish this mission. I went to the hard ware store the other day and didn't see anything of use. After being bummed about it for a while I think I have found out how to do it. Look at this thread and the link they have to a part for a skimmer. I think this would work. Instead of sucking in air, attach the air intake to the refugium (not attached to the skimmer, just the return line) and it will suck in the water to return to the tank! What do you guys think about it?
http://www.reefsanctuary.com/forums/...3794#post13794