If you started your clones in FFOF soil, or something close, no need for nutes for a couple of weeks. Let the plants eat up the goodies in the soil first, then feed FF Grow big at 1/3rd strength for the first time, and go up from there until you reach full strength. Different strains act different when being fed. Some want more food, and others are happy with half or two-thirds strength feedings. Watch your girls close, as they grow old, they will let you know when they need food.
Good Luck-
TMB-