TankedUp Posted January 21, 2021 Share Posted January 21, 2021 Me sand substrate is getting thin from years of water changes. Instead of stripping my tank and changing all of my substrate I opted to simply add some new. I spoke with my fish dealer and he said it would be better than risking a tank crash. My question is do I keep the dirty substrate separate or just add the new over the top? My tank is planted. Link to comment Share on other sites More sharing options...
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