As long as your "crushed coral" is crushed and not in large chunks. mother nature has so many animals that can keep the sand clean, sand sifting starfihs, sleeper gobies, dragon gobies, etc...if the crushed coral is toooo big, it can rip them up something fierce. So, again in my opinion, if the crushed coral is of the smaller size, that should be just fine.
Travis - go check out the "Think Tank" forum here at TRT and peruse a few threads about DSB (deep sand beds) and see what the longtime hobbyists are doing before you commit to one thing or another...
I personally use a shallow, 1" aragonite substrate, and it's worked for me for many years - used to use crushed coral but the really coarse (pea sized or slightly smaller) is a pain in the you-know-what for trapping waste, and as Lise mentioned, sand creatures aren't suited for it, whereas the finer sand is a friendly substrate for them, as well as many tiny fauna and flora that live there.
Hope this helps.
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