Hi, Chew ~
Appreciate the offer, but I'm about 65 miles away in Wakefield. I have a 30-gal. split in half with one-half for skimmer ~ other half for micro algae. Have skimmer sitting on egg crate on top of tank with water level in tank to top of the 30-gal. If I extend return tube into water, water level in skimmer body rises, but very little skim. If I raise return to top level of water, water in main skimmer body lowers & makes skim, but does not fill tube to top. Would appreciate any advice.