Brown spots top leaves, magnesium deficiency?

Hi,

DWC, 7th week of flower, couple of weeks ago she started to develop brow spots in a top leves.

Bought call mag and adding it for more than a week.

Just wanted to check if it is going to help or I've misdiagnosed it.

Cheers

CalMag alone probably won't do it...you might need to add Epsom salts with the calmag to get the mag up enough. In soil I add 1/2 tsp. per gallon with my calmag, every single time I water...but that's soil. IDK about DWC. You can also use it as a foliar for faster results, with lights off of course.

Pics would help. Good luck.

Thanks for quick response. Added pictures later as i forgot first round. I'll get the Epsom salt. Cheers