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I have a 50gal tank with a mag 12 pump. I also use a SCWD. I was told that, that would be enough circulation for my water. However should I still get another powerhead for a counter current?
I have a little 20 that didn't have one in it and all my corals and fish were doing fine. then I noticed a little dead spot behind some of the rocks so I added one and did a couple small water changes. It seems like after I added the PH all my corals got a lot more color and bigger. I would say get one.
If you have corals(like SPS) that need the strong flow than add a powerhead if you feel it's necessary. If you got sofites and LPS you might not need the extra flow.