Flowers have emerged, what fertilizer should I be moving to?

My second grow seems to be moving along well. I just culled the males and am left with five females. At this point there are a couple of runts (18") and three that are about 30". I have reconfigured my light and spaced them out for their flowering phase. My question is about what to feed these girls now that they are out of the vegetative stage. I have grown them in a Miracle Gro potting soil that i enriched with blood meal. Not sure where to go from here though. Suggestions would be welcomed.

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You want to look for a "Bloom booster". In flowering you want less Nitrogen and more Phosphate and Potash. Jack's classic bloom booster is a good product and I personally have had a good run with MG bloom boost..~~GM

Go with a 3 part food like Generl Hydro flora.. and follow the feeding chart from start to end of your grow.. It tells you how to mix the food at different stages of the plants growth.. any 3 part food and you will be happy with the results!