they flow in reverse is only maybe 10% of the flow forward but u can set it to 100% and it will make somewhat of a reverse flow, but even when in forward direction u have it above all ur corals and rocks , the lfow hits the other side of the tank and comes back around but some of it goes in random directions which causes good flow around the whole tank IMO. One thing you can also do is use the extra rotors and cages to have one side of the pump strong in forward and the other side strong in revers. this will give you a good gyre in both directions.
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