I'd venture to say it's your germination practices
That many seeds not sprouting sounds , well,not possible if from reputable seed banks
As far as genetics not being sturdy, again, I disagree 1000%
Many growers are getting some amazing plants outdoors, in kanuckistan where it's not a hot climate, to Africa where it barely rains
Cannabis is a weed, sure some strains will be more fragile than others, but for the most part they are very very very tuff plants
That many seeds not sprouting sounds , well,not possible if from reputable seed banks
As far as genetics not being sturdy, again, I disagree 1000%
Many growers are getting some amazing plants outdoors, in kanuckistan where it's not a hot climate, to Africa where it barely rains
Cannabis is a weed, sure some strains will be more fragile than others, but for the most part they are very very very tuff plants