well that sucks, that the 2nd in 3 days, all the others have same environment and are treated the same, they are rapidly growing unlike those 2 who have just died.
can anyone assume what the problem is? i use a light mix specially for cannabis from a hydroshop, they don't get nutes yet as i read it'll harm the guys the 1st 2 weeks, soil has an average pH of around 6.3, water pH is lowered to about 6.5, lots of sun, around 10 hours a day from the day cotyledon appeared around 30c at day, 25-27c at night, nice wind, etc, etc.
what fucking caused those 2 to die?
maybe soil level is too low or something, f00k that.