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Originally Posted by lockrookie

i run a 4000 on my 90 but i would go with a bit less for flow your sump may not handle that much flow through it try an ehiem 3000 would be good for that tank. ideal flow is 5 to 7 times through sump total water volume. so if you have 90 blus say 10 in sump makes times 7.. you wouldwant a pump that could flow 700gph ish at 4 or 5' of head. keep in mind as well what your overflow ccan handle in terms of flow as well if your overflow can only handle 600 gph and your pushing 700 things could get wet.

Do you run your 4000 wide open or throttled back ???
Using your formula, the 4000 would work on mine, as it calculates out at around 660, using RC calculator.