My one plant is odly taller then the other even tho its the same strain (Afghan) and now its getting brown leaves and brown dots. I think its getting sick. Did I feed it to much? Or can a to low temperature or a to high humidity level cause this?
Edit: The second plant got those dots too and I fed them yesterday. So maybe that is the problem. I also read that the light should be 18 inches above the plants and its only 9,8 inches above my plants. I thought the one plant is so tall because it was not getting enough light. Could that be the proble or are they really sick?
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A PH issue was my first guess. What kind of water are using? If it's city or well water you should have access to a water quality report that will show the PPM and PH. If you are on city water, most cities keep the PH high as in the 9-9.5 range to prevent the pipes from being damaged from more acidic PH levels, cannabis grown in soil likes a PH around 6.5.
You should get yourself a PH pen (and a PPM pen as well). You can spend a couple of hundred for a super accurate PH pen or less than $20 for one that will give a pretty darn accurate PH reading. Get the $20 yellow one from Amazon and just check the accuracy from time to time. It will let you know if you are at least in the ball park.
Usually issue aren't from what was done yesterday, I look further back. If you could share more info like nutrients, amount and how often, etc it would help. Im really interested in the pH value in and the pH of the medium.