Is there anyone that doesn't sift their sand when doing a water change? I've heard both ends of the spectrum here and wonna hear some opinions
I would not recommend stirring your sand. Like Geoff said, it can release a lot of phosphates and other unwanted materials. Just blow off your rocks and siphon your sand bed during your water changes.
If you have a DSB, then good luck!
I would consider a DSB to be around 5-8 inches and a normal SB to be around 2 inchs. If you really want a SB I would go with 2 inches of CC. Just my opinion.