This is my 7 week old purple kush auto she seems to be having some sort of problem and I’m needing a little help identifying. I’m growing in a 4x2 with a vivosun vs2000 at 80%, 5 gallon fabric with natures living soil and ffof. I just started using flower fuel and purpinator and calmag about 2 watering ago, all at half strength. I noticed the deficiency before adding the nutes.
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The purple? Genetics. 
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The brown spots on the leaves is whats concerning me.
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They look great. A little nute burn on the leaves and a few spots can be expected during flower as the plant is feeding all she can.
Have you checked to make sure your ph meter is calibrated?
Have you done a runoff or a flush? Most times problems happen in flower is because ph has gotten out of wack. 
Looks great mate nice big cola try giving some cal/mag i believe its a calcium def
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Ok. Will do. Thanks for the reply
Ph is right around 6.5. I haven’t checked run off. Do I use the same ph meter to check ? This is only my second grow lol
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I recommend starting with environment.
Before adding anything I recommend taking room and leaf temp, and a humidity reading, and plugging it into a VPD calculator to understand where you are as far a transpiration is concerned. A low VPD correlates to high relative humidity which can result in disease and mineral deficiencies.
Ensure your lights are set to proper DLI because a high rate of photosynthesis can increase nutrient use depleting the soil eventually causing a deficiency.
Then pH test a soil sample. Hanna has a great tutorial. If it’s 6.5 +/- .3 you should be good.
Another consideration is water source. Does it contain chlorine or chloramine or any other contaminates? What is the pH?
Then look at your nutrients to ensure you are providing 3 primary, 3 secondary, and 7 micronutrients in your nutrition of choice. If it is Calcium, why?
Thanks for the reply, ill do some research on those things.
Do you think I should hold out on my other nutes and just try the cal mag ?
I don’t know i have seen information that would justify doing that. Have you been measuring the ppm and ph of nutrient solution in and out?
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No, just the ph goin in. I don’t have a ppm meter yet. It’s looking like I better invest in one
Is you ph meter new and what kind is it? Did it come with a calibration kit? PH meters will get out of calibration from time to time.
Yes— use the same meter
FYI:
Yes, its a few months old. And came with a set of calibration powders which I already used. I’m watering with tap water which I leave out for 24 hrs. And add all my nutes to. Calmag, recharge, and flower fuel all at half strength. I just received some purpinator ill add to the mix as well.
Check your water report. If your water has chlorine setting it out is all that is required. …but if it contains chloramine setting it out will not remove it. You’ll have to filter or treat.
Also some LED lights offer a smaller spectrum of light. Certain wavelengths the plant requires to generate calcium are absent. So keep an eye on calcium deficiency when growing with LED.
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Thanks for the link, it definitely looks like a calcium deficiency from what I read.
Ok thank you !