I have 3 plants, White Widow, Northern Lights and Train Wreck. 5 Gal fabric pots using a mix of bottom 1/3 Nature super soil, 2/3 mix of super soil and Coco Loco. In a 3X3 tent. Lighting is 600 King Led and 400 W Mh/HPS at 75%. Using filtered water, pH to 6.5-6.8 with calcium citrate crystals. No other nutes. No overwatering. They have been in 12/12 for almost 2 weeks now and just starting show flowering. I am wondering what is causing this as it is not on the whole leaf, some are only half the leaf the other side is fine. Does not affect the whole plant but a few leaves here and there, mostly on the White widow and train wreck. Thanks for any advice other than this they look great!