How many gph can flow through a 120 rr?

[rs2208]

How much water volume can flow through an Oceanic 120 gal RR tank? I am trying to pick out a pump for my return.

[Doug1]

Is it equiped with a single or dual overflow?

[rs2208]

The tank is a standard 120 rr with 2 overflows - each with a 1" return. I am going to have about 7 to 9 ft of head pressure. The sump will be located in another room. I am planning on running 1.5" pvc to 4 - .75" returns. I was thinking about the Dolphin Aqua Sea 2100. It is supposed to put out 1800 gph at 7ft. What do you think.

[Minnreefer]

That pump should be good.

We have an oceanic 135 with dual overflows, my durso pipes are 1 1/4 but I don't remeber if there is a reducer. Anyways, I could hook up a mag 12 and a mag 18 at the same time and not overflow the tank.

HTH

Jon