What is this Brown Spot? Opinions?

Hey! What’s your PH looking like? Couldn’t find it in the data, should be at 6.2 in flower that way she can absorb the correct nutrients. Doesn’t look underwatered because she’s not droopy. Doubt it’s a nutrient lock.. Those brown spots look like the beginning of a deficiency. I’m in between calcium or phosphorus. Given that your in flower and aren’t giving any nutrients I’d say it’s one of those two. I’m flower she’ll need a little something more of nutrients or else she’ll get yellow and brown pretty fast. Good luck and happy Growing.