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Oh boy...IMO depth is apersonal preference. There are threads here at TRT that address deep sand beds and potential problems that might/have happened.

Substrates...let me see if I can get you to answer that question. What's at the bottom of the ocean? Crushed coarl or sand. IMO if you are re-creating mother nature, then use what she uses.
 

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Please understand, this is just my opinion, ok?

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.
 
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