denvig said:Euro-reef CS6-2 on a 110 Gal. with a 33gal Sump. It works great but I have been thinking of up sizing the pump from the 3500 to the 5000 that way turning it into a 6-2+ Not sure if it will run any better but you know how we are always trying to get to the next level. Any one interested in a sedra 3500 with needle wheel, inlet tube with air hose, U tube etc.