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First, as sand dwelling critters roam around it will start to mix and bring sand to the surface again to restart the problem,
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I have a mix of crushed coral and aragonite in my tank and I find the opposite happens. The arag. is smaller so it settles under the crushed coral after the critters stir it up. Its a density thing. In a predator tank I would have gone with a fine crushed coral, provided you wont be having a lot of sand dwelling creatures.