looking for new pump

[juicebox]

looking for a new pump for my 80g my last one is dieing on me and i dunno how many gph i need for a reef tank from just the pump but i got a canister filter so any help would be good

[clkwrk]

external or submersible? I have 2 pumps which put out around 500-600 gph which supplys one 1" drain good.

[juicebox]

external and i got 2 1" that T together in to the pump

[clkwrk]

right but what size is the drain in the overflow ?

[juicebox]

i dont have an overflow the tank is just drilled

[clkwrk]

I have this

http://www.marinedepot.com/md_viewItem.asp?idproduct=LG2125

and this

http://www.marinedepot.com/md_viewItem.asp?idproduct=IK1125

[juicebox]

would be 1000 gph be to much>?

[clkwrk]

Then its a closed loop and any pump should work but my guess would be 1000gph would work or less. Both pumps I have would give you almost 800gph with zero head which a closed loop has no head pressure.