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I've heard/been told that a tank should have a circulation rate of at least 10x the volume of the tank. If you have a full blown reef tank (which I don't), though, I think the circulation should be higher.
I just purchased some maxijets from premium aquatics (sponsor). They should be here on Friday. They also have a $5 'coupon' if you're an aquarium advice member, which paid for the shipping. HTH.
Check with Darin at Captive Reefs (another sponsor) as well. I'm embarrassed to admit that I don't have the pumps/powerheads page up on my site yet . You are making a good choice with the Maxi Jet powerheads...they are top quality.
I also have a 75 gallon that I just started yesterday....I'll go with FOWLR then a reef much later. How should I place the PH in the tank? I guess I'll get 2 or 3 powerheads.