leaf damage

Hello everyone i have a issue i am seeking help on, i am a beginner grower and i am wondering why a few of my plants have the same issue i have provided the images below in hopes that someone can help explain or resolve my situation. a little insight i am currently in week 6 of flowering my...

Hey guys/girls i've been stumped over what's happening to my leaves. Currently i'm running a 600w dimmable set at 400 using ionic feed at 5ml per ltr for ionic bloom and 1ml per 2 ltr for the pk boost, i've got 11 in coco with maybe three or four showing the damage on the leaves i have in the...