RQS Fat Banana Auto

It looks like a cal/mag deficiency but I would not worry about it this late into the game. You’re nearly to the finish line by the looks of things. I would just water with pure pH balanced water from here on out. Let the plant use up as much of the stored energy as it can, in my opinion it really helps the cure process. For future grows, I would boost your cal/mag up slightly during flowering, especially the first 3-4 weeks. If you wish to run cal/mag during your whole grow it would be best to find a nitrate free source of CalMag to do that. I hope this helps.