i use miracle grow patio formula for vegitative growth and miracle grow african violet formula for flowering. remember to stop useing fert a few weeks before harvest to clear out the nutrients, you dont want to smoke that shit. use only regular water the last two-two and a half weeks. start out with small concentrations of the solution and steadily increase the amounts. you can steadily increase it the longer it grows. watch for nutrient burn tho this is yellowing of the leaf edges. if you see this, stop using the nutes and flush it out with plain water and use only water for a week or so.
happy growing