If it is not nute burn, try moving it out of the grow tent...I had a hydrofarm habitat that killed several plants, which was a known grow tent problem.......they turned yellow, then brown, then crinkled up, then died......also, when they were seedlings they were light, light green, which is not how the strain started out in other, non-tent grow. I tore that fucking hut down and hauled it to the dump....300 dollar trash!