I'd like to reshape my planted tank and I was just wondering if I could use the $1 Wal-Mart soil as a substrate or should I stick to mirical grow potting mix. It is pretty fine so I wanted to see what you think. I put it in this bucket just to see if If it would clear and it's been like this since yesterday but keep in mind it was put in full force of the hose for 15 minuites.