Dsb

[Jag586]

How does it work in a refugium? All the ones I saw on the net show what looks like the water passing over! I can't wrap my head around how the bb on the very bottom that gets rid of the nitrates get that much water circulation / flow

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[joe jaskot]

Here is a good read on deep sand beds: http://www.ronshimek.com/deep_sand_beds.html