Masterkush indoor organic

Just watering, topped all 4 this week. I've got 21 plants all in the same soil and same growing conditions. I have 3 plants that are sick and one genetic fuckup. All are Master Kush and this will have to be the best weed ever for me to grow this strain again. 3 grew fast and are deficient in cal mag, the other one is growing slow and staying squat its going to be just a little fat cola that's hard to do any training with. So far I'm not too impressed.