I’ll Try to keep this short and sweet. I have four different strains in a 4 x 4 grow tent with a 400 W HPS. Coco, general hydroponics flora nova bloom, big bud additive and Cali magic. One of the plants, my pure Indica it’s starting to get brown discoloration it looks like rust on the leaves. I’ve never done the whole pH thing before so I don’t know what the pH is but it’s never been an issue for me in the past and the other plants are fine.
If anybody tell me, typically, what is the issue with the leaves when they look all rusty? More importantly what can I do to fix it? I got about one more month of flowering to do on these.