I'm setting up a new AGA 65g and am in the process of plumbing it to the sump (30g). I got a glass-holes overflow kit and drilled the overflow for a 1.5inch bulkhead in the back center glass. For the returns, I drilled 3/4ich bulheads with locline fittings in the back upper corners. Plan will be for overflow to drain down and split into two to drain into the skimmer section and refugium. Are there any problems with some 90 degree bends in the overflow drains? Also, where should I place any valves? Will be using a Mag 9.5 for the return which will split to exit the two returns. Finally, still debating on skimmer...either Euroreef RS135 vs. ASM G2($100 cheaper). Any thoughts?