Well I have a 90g with two Koralia 3 (850 GPH) powerheads in my tanks, plus my rio pump from the sump. And I’m happy with the flow I’m getting (I just up graded them too)
- now keep in mind I don’t have any SPS corals and those guys love crazy flow so I guess it depends on what you plan to keep in it. Either way more it better I would say
