Leaf indication

Anyone have a clue what this is. It started out as little brown circle


Try this

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@tangman Iā€™m having a similar issue, anyone know what is it and how do we proceed?

best way is to check ph in and out first. Then supply all the details of your grow as soon as possible. Then we will have more information about the possible cause of the dilemma

I believe that calcium/magnesium deficiency. I added cal mag to my watering and standing by to see my out come. I ph my water to 6.2 and alternate tigerbloom. Starting week 6 flower humidity at 70% temps stay mid 70 to 80. Summer finally starting to show up so moving portable AC unit into room to drop humidity to 60% for the last 3 weeks since the girls started putting weight on.