The number of pumps you will need will vary depending on what 'extras' you are planning to run. For the return Eheims are proven champs. As mentioned in your other thread, a 5 times turn over rate is good. If your display is 120g and your sump holds, say 25g, then your total volume equals 145g. Give or take a few gals in the plumbing. 145 x 5 = 725 gph. When shopping for a pump remember to use the head loss chart, usually displayed on the box. 'Head' is a term used in plumbing to calculate a pumps ability to push water straight up. If the distance from the pump in the sump to the outlet in your display tank is, say 33 inches, then you need to use the 3 foot head loss curve. You may find that the pump rated at 725gph will only deliver 500gph at 3 feet. This is kinda advanced plumbing info so to save yourself confusion i'd just aim for a 10 times turnover rate, lol.
If you need more plumbing info we are happy to help!
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