I don't no what's happening with this room some plants have got the problem and some don't its also not on every leaf don't want it getting worse if its a simple fix
In my opinion is just a small overfertilizing issue. Different strains need different quantities of n-p-k. For example some sativas don't like much Nitrogen but in the same time if you have an indica strain in your grow tent you have to provide different solution. If i was you i would just water clean water and observe the new shoots of the plants. Wish you the best!
@XipsiomegaLet he's using
Sensi Grow Professional Series Part A (NPK): 9-10-28
Sensi Grow Professional Series Part B (NPK): 15-0-0
15mg in sum since week 3 plus CalMag 7.5mg per gal
i'd say it's not a small overfertilizing issue 😭