I made the fuge out of acrilic from home depot, the glue i used was Marine Goop, also from there, this is gravity fed from the overflow box,2 -1" lines to the wet dry, one splits with a T and runs to the fuge, with a ball valve to control the flow, both pipes run to the wet/dry, over bio balls, then into the skimmer chamber, over a baffle to control bubbles then back to display with a mag 700gph, i have 2 lines coming from the fuge to end of wet/dry then back to display , so what the system is doing is completing a circle. Since the fuge is made of acrilic the holes are easyer to drill then glass, bulk heads i made from pvc from HD as well. hope this wasent too hard to understand? let me know if you need any help.