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I'm not a big fan of substrates in the sump proper for critter production. I much rather prefer a suspended matrix like the Chaeto ball or spaced polyester filter pads (on a string to act as a pod condo).
Fine (<1 mm) sand for a DSB for NNR (see DSB bucket thread stickied atop this forum) is good. But beyond that... I am not a fan of placing rubble, live rock or coarse sand in the sump. In most cases, it accumulates/traps more solids than its worth (for pods).
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