Why do you need that high of a return pump??? A Mag 5 or 7 would do or something equivalent. Unless your overflow box is rated for something higher. I did not notice your tank to be RR or is it???
I was running a RioHF (1290GPH) moved to a QO4000 (1017GPH) and then onto an Ocean Runner 2500 (630GPH) and I really like the flow rate of the slower pump quite a bit more. Sump flow just seemed to fast before.
All flow rates are, of course, @ 0 or 1 foot of head, and this is on my 90 as well.
What's it doing? Sometimes by replacing the impeller and the cover would make it work again. I had to do that not long ago.....You have to replace both at the same time pretty much....
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