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Originally Posted by Funkytone
Is there any risk to using all new saltwater?
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No, but make sure the SG and temp are exact (or darn close). Its just that the used saltwater has already been conditioned/has various good bacteria in it etc. Might be a bit easier on corals and fish. You can always just acclimate corals/fish to the new water as well. Or you could go with using like 10-20% or something.
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Originally Posted by Funkytone
Think the sand is bad even if its only 6 months old and looks pretty clean? I'd rather not buy another 60 pounds.
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I'd put it in a bucket or two, fill with water, stir with your hand or a stick or something, get the crud to rise to the top, then pour off the water and repeat this as many times as it takes to get the water less murky looking. Odds are the water will be a disgusting greyish brown. Try to get it just light grey or white.