how much of my nutes shld i be using in a 3 gallon pot.

so i'm growing some master kush ( first grow by the way ) and im about 4 weeks into flowering. been using jacks classic dynamic duo and some cal-mag. I feed the girls 1 gallon of water every 8-10 days. half booster/quarter all purpose/quarter cal-mag always at a ph 6.5. the temp is always from 76-82 degrees and an Rh from 39 to 57. although they seem to be doing well I have noticed some brown dots starting from the lower leaves and then working its way up the plant. I thought everything was going well but obviously they're not. the girl is now fully covered in brown dots all over the outer leaves. I beleive my parts need to be fixed to either help her or at the least not let this happen in the future. any suggestions ???

do you have any pictures?

Soil with nutes? Soil less mix? Makes a diff
Sounds like cal/mag to the rescue
Fred

soilless mix yes ... was thinking had to up the cal mag but wld i go from 1tsp to 2tsp per gallon or just add more then a quarter gallon of the 1tsp per gallon mix ?

this is the problem.. tell me what ya think???

That last picture confirms it, pH is too high causing a lockout. 6.5 is for soil. Soil less is happy at 5.8-6.1 or so. Flush well with 6.0 water. Resume feeding at same level, maybe up the all purpose a little.
Should be ok now, watch em close.
Fred