leathery

Hello to all, First of all, I have to say I realy did my homework and tried to find, whats happeing to my mj. I have 250W HPS in 60x60x150 box. In the box I grow 4 platns, 2 blue dreams (blimburnseeds) and 2 white strawberry skuns (strain hunters). All plants are 8 days old (I started counting...