If you are flowering with only a 125watt cfl, go 12/12 now. And do like said above and train it/bend the stems so the plant gets the best light penetration. With CFL you are not going to need hardly any fertilizer especially if you are using fox farms ocean farm soil...it's hot to begin with. Plus that is bagseed, so you are better off underfeeding than overfeeding. I say give it a 3-5gallon bucket to grow in and just use the ocean farm soil and you will be good using plain water up to harvest. If you notice deficiencies starting to arise, then do an all purpose fertilizer.