Need to buy a return pump

[easygoer2]

I'm setting up a new tank and not sure what return pump to use. Let me tell you what I've got and you can tell me what you would recomend. The tank will be a 180 Deep Sea and it has two corner overflows. Each box is 12x6 with a 1" drain. How much GPH is each overflow rated? The pump will have aprox. 8 feet of head pressure. Any advice would help.
Thanks easygoer2

[poppin_fresh]

I would guess about 500-600 gph max flow through each overflow. I however, wouldn't want to run any more than about 600-700 gph total to the sump and back. I am a fan of a lot flow in tank good, but a lot through the sump...bad.

[adtravels]

I use an eheim compact plus 5000, dont know if they avaliable in the US yet but an awesome pump for the size, no noise.

[davocean]

I use a Eheim 1262, perfect flow, dead silent, no temp increase.

[mg426]

Use the calcultor to find a suitable pump. 500 to 600 GPH back to the tank after head loss sounds about right to me.