Use what Chuck calls the "handicapped rig." A float with weight 6-10" above an egg fly and scud dropper (about 12-18" off the egg). You'll need weight. You want the flies on the bottom, where they are naturally occurring. Depending on water flow, use a BB or AAA, or combination of any size until you get bit. You want the float to be, usually, about twice the depth above the flies. So if you are fishing 4 feet of water, have the float 8 feet above your flies.