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Currently have a 400l tank, looking to change the sump pump. Read through the threads n know that 4x is the recommend flow rate . Need advise, I'd I use 6x flow rate is it ok? Keeping some high bio load, 17inch aro with 2 small rays.
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6 is fine.
Ensure that there is adequate filter media and the media is spread out evenly in the sump so that water flows into the media rather than around it. Get a good pump.