Water flow in 56 gallon column tank

[KPollard1986]

So I've been thinking about this a lot lately. I currently have a 56 gallon marineland column tank set up with about 57-60 lbs of LR. I have a few corals(hammer, trumpet, favia, xenia and some zoos).I currently have an aqueon 500 circulation pump in there with the return for the canister rated at 400 gph. My question is, do I add more circulation? Everything seems happy, but I feel like there should be more. Pic attached

 

[sfin52]

You could add one a small power head that flows behind the rock where stuff could build up and hard to clean.