I'm going old school.
I always had "shallow" DSB's like you're describing.
This time around, I dropped around $300.00 for sand, around 160lbs.
It's probably 8-10 inches in my 36" tank.
I used 1/2 live sand and 1/2 of some dry sand I soaked in substrate sauce.
There was almost no cycle. (I used bleach cured live rock I've been cooking for months as well).
I don't run a sump (RSM 250) but agree, with the option, it's a cleaner way to achieve the benefits.
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Red Sea Minimum
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