"...once it flowers..."

do you mean, "when i decide to flower the plant, i'll add another CFL?"

in my opinion, and probably many others, switching from 24/0 to 18/6 is worthless and unnecessary. i guess if you've run into power consumption issues, maybe. but 4 (or even 5) CFLs aren't costing you much to run, even 24 hours a day. if perhaps you are confused, your plant WILL NOT FLOWER under 18/6 lighting.

oh, and also - your soil looks like it has poor drainage. i'm a hydro guy myself but just my two cents.