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    Not only is crushed coral tough on the animals that interact with the substrate, it also becomes a ditritus trap = eventual higher nitrates. I have found special grade to be the best substrate in a reef tank. When aged and covered in a bio-film it does not blow around much when compared to sugar fine. Sugar fine is best for refugiums with shallow or deep sandbeds.
    Last edited by Ping; Sat, 29th May 2010 at 08:45 AM.

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