I've got my second white widow growing and it is 10 weeks in. I tried topping the plant this time which may account for the difference in grow time, but my previous widow has flowering already in week 10 and this one is not. Also, this one has started yellowing. I've kept PPM under 600 and PH at 6.0 but feared that the yellowing was still burn so I flushed out the bucket with new water at 350 PPM including minimum amounts of Cal/Mag, liquid karma and B52. I've inserted pics of both the first grow at 10 weeks vs this grow below. Any ideas?