Pump Size for my Wet/Dry - Help Please

I have a 120 with a 40 made into a sump I use 2 rio 2500. witch are each 782gmh

If ya choke it down too much you'll greatly shorten its life span. Diligent water changers, responsible feedings and good husbandry is better than a big massive overpowered pump.

I ended up going with a Mag Drive 18. I realize it's probably way overpowered, but I can always use a valve to tone it down a bit. I just wanted to make sure it has enough power for my tall 220 gallon tank. I'll look into that poret foam.

+1 on the Poret foam!

That nonsense of 7,8, 10 x an hour is just that. Nonsense. Feed the right amount, be diligent in water changes, and keep good bio / mechanical filtration and your fine. That 7,8,10 is just a macho "Richard" thing.

Thanks for the quick reply.
I'm asking because I've heard you want a water turnover rate of 7-8x per hour - is that correct?
If so, the pump I listed gets 900 GPH, which would be only 4x turnover. That also doesn't account for the loss because of the height (30" tall stand, 30" tall tank). Wouldn't this be underpowered?

I'll definitely take your advice on the valve. I just want to be 100% on the pump before spending $100.

Thanks,
Ryan

That pump will be plenty. Maybe even too much. Your best bet is to buy a QUALITY valve that will allow you to limit the return and achieve the balance. Notice the capital letters on the word "quality". Home Depot sells valves for cheap. Go to a real hardware store or plumbing store and buy the BEST valve they have.

I am setting up a 220 gallon aquarium that is drilled and has (2) built-in overflows. The drilled holes in the bottom glass are 1-1/2" without the bulkheads in there.

I'm planning on making a 75 gallon aquarium into my sump/wetdry filter. It will have 5 gallons of bioballs and mechanical filtration (filter floss and sponges). I'm trying to figure out what size pump to get. Will the Lifegard Aquatics Quiet One 4000 be enough? It's rated:
Max flow: 994 GPH
Max overhead: 10.17 ft

I want plenty of power because this is my only filter on the tank, but I also dont want to overwhelm what the overflows can handle volume wise.

Thanks,
Ryan