Overflow box size?

[Ratpack]

I have a pump that according to the head loss calculator will be putting out about 950 - 1000 gph. So my question is, do I buy a overflow rated for 900gph and throttle the pump back (if I indeed get that much flow) or get one rated at 1000gph?

[Poseidon]

I'd get one rated for 1200gph or more.

[Reefland]

I agree, get the overflow so that it is over-rated for the pumps output. No need to lose any of the pump output and the overflow should alwats handle a few hundred gph over the pump.
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[Ratpack]

Thanks, now one more question. The tank is a 75g and the sump is 30g, is 1000gph too much flow for that set up?

[smpolyp]

As long your returns are placed well you will be fine. Depending on your coral you may need some more or less.

[Poseidon]

I was running about that through my 90 with a 30 gallon sump, so I think you will be fine. I had a MAG12 as a return pump, and was able to run it wide open.