My tank has a bit of a white cloudiness to it today. Let me give you some background... 125 gallon tank, lightly planted. I added SMS substrate 2 weeks ago (I pulled out all the gravel) so I am still cycling. Yesterday I did a water change and it has seemed cloudy ever since. The SMS was a bear to rinse. Even when I put it in the tank after so many rinses I thought I was insane, the tank still looked like mud. But it cleared up and until yesterday's water change it looked fine. I changed about 20% of the water. So what is the white cloudiness? From not being cycled? Could I have put too much Prime in the new water? Is the SMS just not clean enough? Thoughts?