Ok so this is my first grow so be nice. I have two northern lights special plants and a mindbender plant with almost the same problem both kc brains strains. I know this company has bad reviews but I mean come on. I also have some black domina og Kush hybrid along with some grape gum by ripper. Any ways im 3 weeks exactly into flowering and it's not many but some of the larger fan leaves are showing this weird deficiency. And it's only the kc brains strains. I am growing under 1000 wt hps temps are currently at 75 with 30%\thumidity. I am using gh flora series with additional Cal mag. I just flushed them both and the problem seemed to get worse anyways here's some pics oh and the ph is around 6.0-6.5