I used 24/0 for the first 4 weeks, then changed to 18/6 and am now on 12/12...

worked great, I have had no real problems thus far

I started of with a 28w flouros for 3 plants, and 2x20w CFLs for another (all 24/0)...after about 3 weeks I swtiched on the 250w MH.

I used baby bio fert (11 -6-4) after the first month for 2 weeks, and am now using 15-30-15 for the next couple of weeks.