1. You can suddenly change to any 12/12 light cycle you want...just make sure there are no light leaks during the daytime.

2. Most tap water is OK to use. Do you know the ph of your water?...my 7.3 ph well water worked great with MG soil...:thumbsup:...it runout at 6.7 ph.

3. You need to maintain 70-85 degrees and introduce fresh air whenever possible. Use as many fans as necessary.

4. I have no experience with CLF's. sorry. There's lots of CFL grow logs: check them out.

5. Any good quality potting soil is OK. IMO. Mix in 20% perlite for good drainage. Water should go in and flow right out the bottom with ease.

Good Luck!