How i do a complete Aquarium water change and a full clean of my fish tank.

Thank you for sharing
<p>I'm wondering what you mixed into the first rock layer. Sand &amp; Rocks? Very nice video if someone has goldfish or Koi.</p>
<p>It was a mix of smaller rocks from an old tank and sand i had collected from outside which i then boiled for a couple of hours and dried / sieved. Thanks for watching.</p>

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