Once you get that all set up you should aim for a tank/sump volume water turnover that will suite your needs. There is a lot of debate on what the right number is, I personally like 6 to 10 times.
If you are looking for budget pumps you should look at Danner Mag-Drives. They are tanks, never break down and can be run internal or external.
If budget is not an issue, have a look at Reeflo, great pumps.
Ray
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