Welp, I got real frustrated with the cloudy water in my sand 10g, so I did a couple things. First, I changed about 50% of the water (note there are no fish in there). Waited about 4 hours. Then, I put a powerful filter on after no improvement. It's been on the tank for about 16 hours, and the water is still cloudy. What is going on with the sand? Also note, I did clean it several times.