Brown spots

So took a look at my girls and noticed some brown spots on my leaves (which started after using protekt hmmmm!) But anyway I am assuming I need some cal-mag. The question I was wondering is how long to use it and will the brown spots on leaves return to normal? By the way ph is at 6.4 and I have not started giving any nutes thus far they are 2 weeks old and I'm using pro mix organic was planning on starting nutes this week until I saw the spots. Thank folks

Post a pic if you can OP, makes it easier to help. As far as I know once you go brown you ain't getting green back.

I will see what I can do

can't post a pic will try to later.

well as it is stated I've got brown spots on my leaves so I mixed some Epsom salt in some water until I can get some cal mag. I mixed tbs to a gallon of ph water but when I checked the run off it was high should I be worried and how do I fix the ph so that the run off is stabilized?

bump......

the very first step in remediating a problem plant is assessing the values. PH being #1. if PH is spot on then consider salts being too high or low. Confirm your findings/suspicions with a test sample. If spot on move to environmental conditions being off for what YOU are providing the as far as food and water. Temps and RH make a huge impact on plant growth as well as if indoor, ventilation is a really big part.

chances are(without a photo) it a calcium deficiency