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I always just wait till my plants are 30 days old before I start to flower. It doesn't really use that many nutes. That doesn't come till already know the sex.
When vegging plants I usually don't give any food till about 3 weeks into veg. I do dwc and am using sensi grow and bloom. I use very little veg nuts. Maybe feed them once at 300ppm before flower. Haven't ever grown soil so Im sure that different.