After being happy with my DIY 55 gal sump for awhile,here I sit in front of the tank.I have 2 brand new 55's in front of me.Do I do a seperate sump for each overflow and return?Or,do I do a dual sump refugium setup?Tank is a 180 with dual Megaflow overflow/returns.I have 11 feet wide under the tank to play with.2 Mag 12's are pumping it back.Any ideas?John