D33jWcommentedweek 1031m ago
Yes, it could definitely be Cal/Mag issues — at this stage of flowering, the plant needs more of it.
You should also lower the temperature in your grow space — 29°C is too high. Try running the lights during the night when the room is cooler. That should help you stay around 26°C, which is much better.
Do you have a circulating fan in your tent? If not, add one as soon as possible — otherwise, you'll risk mold issues. The leaf symptoms you're seeing might be the beginning of such problems, so be careful!
Also, watering 3 liters at once is too much — you’re saturating the roots, and that makes it harder for them to breathe properly.
It’s better to water daily with 1 liter instead — this will support the roots and help the plant function more efficiently.
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