Looks to be the start of cal-mag deff. or one or the other. its still early so its hard to tell but either some cal-mag+ or epsoms should help but I would recommend checking your ph first..... Ladies look good by the way. I seem to get it every grow I do indoors and I have always used cal-mag+ and my ph is 6.1. as a matter of fact I am dealing with it right now also