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Regarding this, how many GPH do I need for a reef tank?

Valuable Member. Return pump on a 120 I'd say acontrollable pump that can do somewhere around 1000-1500GPH. As for flow in tank, it'll depend on the typesof corals you want. Typical mixed reef I'd say around 7,000GPH.

how big should my aquarium sump be? Sizing The Sump At a minimum, your sump should be 20% ofyour tank. If you have a 75 gallon tank, then your sumpshould be at least 15 gallon. But in reality, youshould go for the biggest size that fits inyour stand (remember, more water volume, more space for media,etc).

Keeping this in consideration, how much GPH do I need?

We generally recommend that on average, you turn overyour aquarium volume four times per hour. This means that if youhave a 30 gallon tank, you need a pump and filter with flowrates of around 120 gph.

How many times should a saltwater tank turnover?

A healthy tank water turnover rate tostrive for is six to 10 times per hour. Manyaquarists feel that higher turnover is better, especiallyfor a reef tank system.