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Originally Posted by dirtyreefer
I would vacuum it as much as you can because your sand bed eventually becomes a nitrate trap. A cleanup crew won't get rid of your nitrates, they will just breakdown the uneaten food or waste before it becomes ammonia, and won't erradicate the nitrate.
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I think you mean to say "phosphates" not "nitrates." A sand bed, just like live rock, has no trouble managing nitrates (in moderation), as per the nitrogen cycle.... It's the phosphates that have nowhere to go and that end up binding to the calcium precipitates.