I've heard no nutes at first also, but I think it's more strain dependent, I like to run Olivias cloning solution added to my water for the first two weeks (massive roots since I started doing this), with 1/3 strength veg week 2, 1/2 strength week 3, and a veg/bloom combo 4+5, my plants are happy and healthy, so feed those ladies!
I believe my girl is starving for nutes,,,so I fed her @ day 12...she looks behind, but the shot of nutes put some green back in her...I always here no nutes till like 3 weeks, but me growing in soilless mediums I think i will start feeding around day 9-10