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Hi,

I am upgrading my tank from 85gal DP tank to 135 DP tank. I have my tank over 4 years. I am wonder if I can move my old sand from existing tank to new tank? I know most people said using new sand but sand are expensive. I am wonder if I can use old sand and add some additional new dry sand to it. Please advise.

Thanks,
 

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Shark..but a friendly one
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Good morning! What kind of shape is your 'old' sand in......any issues with water quality, algaes, 'deep, undisturbed for a LONG TIME'? As long as it's clean, and no underlying issues, I'd say sure. If you're not worried about carrying over it's 'biological benefits', I'd give it a good cleaning to play it safe.
Hack
 

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This is one of those that is a ya it could be fine, or are you transferring problems from one tank to another. Only you can tell that.

As Hack says if there’s no underlying issues, go for it. ”New” wet sand in a bag comes with a lot of benefits. It’s good your upgrading size so there’s room to mix in some new sand.
 
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