Well, that makes at least 75% of the 'fuges useless including mine. lol. Wet/dry's are more of a p.i.t.a. than they're worth. Been there. A used glass tank is truly the easy way to do a sump that actually works.
The refuge will help your tank but won't even come close to the value of a quality skimmer. Mine 'fuge is 12-15 gallons & works pretty good. The entire sump is a 40 gallon long tank split in three sections. My design came from Melev's site, also. It's version "F".