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Black spotted leaves, what is the cause?

Hey fellas, I have variety of 50 reapers with a few Fataliis and Jalapenos and some herbs. They're all about 5 months old and not doing so well the last few months.
 
There is black spotting impacting virtually all plants; however, some leaves only have yellowing tips or yellowing spotting. The black spotting eventually turns the leaf completely yellow and it falls off. I have not noticed many bugs, except the odd thrip or fungus gnat. The spotting is not affecting the herbs at all, the Jalapenos seem to be very resistant to it, and one or two reaper plants seem to be in perfect condition.  I am at a loss for what to do because I can't figure out the cause.
 
I am growing these using the kratky method with a solution of 2.4g masterblend, 2.4g calcinit, and 1.2g epson salt with solution PH of about 6.0.
 

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I think some of my sun damaged peppers look at bit like that... but it's only my first year growing, so take that with a heaping palmful of salt. The damage does look a bit worse on the inferior surface, is that the general pattern?  
 
yep bls, I get it when I grow indoors but once plants are moved outside it goes away. Maybe try increasing airflow around plants and remove excess humidity somehow. 
 
I had the plants stuffed very close together without much airflow. I have since spaced them out and I will be adding a small fan to my grow space.
I googled what to do for BLS and have purchased a copper sulphate spray that is supposed to help control the spread. Hopefully I can report back that it has worked.
 
 
 
I'm glad I came across this thread, I think I might also have a BLS issue too. Fortunately it's just isolated to a couple leaves on just one plant. I've just pruned those leaves and hopefully I don't need to resort to anything further. 
 
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Try foliar application of AACT (compost tea). There's some support for it to decrease spread and growth of Xanthomonas (and other species of pathogens).
 
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