Pump size?

mule170

Reefing newb
I have decided to put my reef tank back into service after sitting empty for 2 years. I need to get a new water pump and I dont know how many gallons per hour I need. It is a 20 gallon tank with a 5 gallon sump. The inlet water line is 5/8 i.d. and the return line is 1 inch i.d. The overflow box is 4x4x2. Any help you could offer would be great!!
 
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