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Actually crushed coral is still a good medium to use as it is a strong water buffer and helps prevent "dead zones" typically caused by compacted sand. In my opinion, sand requires more maintenance than coral (which really depends on the tank setup). A plenum type under gravel/sand system is ideal if you want a clean and balanced tank but this requires a lot more substrate, ~ 4". In any event, I believe 1/2" of crused coral alone is a little on the shy side. This can be mixed with dolomite or aragonite to increase the thickness to 1" - 2".
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