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A lot of people on here recommend at least 40 time tank volume in circulation pumps.
get more than one so you can move them around to get rid of any dead spots. (where detritus settles)
You also need one at the top to agitate the surface to promote good gas exchange.
The Maxspect Gyre and the Jacod cross flow are good wave makers. One of them and a couple of other power heads might be enough to get good circulation.
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