I've seen sump/refugium combos. THe designs are essentially the same idea, with the refugium water being fed directly to the pump area and bypassing the skimmer portion. There's actually several ways you can make this work. One of the simplier ways I can think of is to buy 3 seperate 10 gallon tanks and use one for the refugium, one for the skimmer, and one for the pump (and other accessories like heaters). The overflow is split to feed both the refugium and the skimmer tanks, and both overflow into the pump tank. Obviously, the skimmer and refugium tanks should be elevated above the pump tank (situated between the two other tanks). The only hard part is getting someone to drill holes for you if you choose affordable glass tanks. Acrylic is easy to drill, but acrylic tanks costs more.