I'm not running mine as a nitrate factory, no bioballs. I'm running just filter wool and the foam before the return pump. Fairly easy to clean, removeable trays and lids etc. I'm thinking of running mine as a refugium. There is about a 3.5 to 4 inch bed a guy could utilize.
I love it compared to the straight box sumps I have had in the past. Very quiet great mechanical filtration etc.
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