General rule is a a pound per gallon or so i think, I like keeping the sand beds thinner personally they trap a lot of crap and can trap deadly gas pockets if stirred can wipe out your system. I usually run with under a 1/2 inch or so and it has never caused me any problems.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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