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sand or gravel?

Hi all,
        I have a question concerning a new tank set up.  Should I cover my
laterite substrate (Thiel Aqua Tech) with sand (#16 sandblasting grit) or
just aquarium gravel?  I have heard that gravel may aid in preventing
compaction, but I've also heard others reccommend sand.  Any ideas?  Thanks
in advance!!

B.J. Smith