Leaf discoloration, wilting, and dying. PH is fine, please help

Hello all, I have 4 plants going in a 4x4x6 tent, with a vented 600 watt hid light system, and just recently switched them over to flowering a few days ago after nearly two months of vegging. They are getting a bit too big and my tent is getting crowded. I've been noticing a few things happening with the leaves lately that I am concerned about. Some of them have an overall discoloring (yellow/brownish), some leaves are like rotting away, wilting, dying, and eventually fall off. Alot of this is happening on the lower portions.

I am using the popular Fox Farms soil (forgot the actual name, maybe ocean something?), have fed them GH flora nova grow every other feeding. They have been using alot of water and I've been overall feeding them about every other day. Temp and humidity have been monitored and have been fine. Runoff has been tested often and has consistently been between 6 and 7. What could be causing this? Should I be concerned? I'm thinking it may have to do with lack of light toward the bottom or perhaps the humidifier was oversaturating the leaves and started killing them? Thoughts?
 

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the spots may be calcium? i ain't no guru.
The lower stuff yellowing and dying off is pretty much normal for me and think it may be from lack of light. nothing to worry about there, just pull 'em off.
The others do look overwatered or something, I really don't know.
I would recommend some cal-mag for those brown spots tho, it corrects common deficiencies.
This is what calcium def. looks like. you can judge.
 

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the spots may be calcium? i ain't no guru.
The lower stuff yellowing and dying off is pretty much normal for me and think it may be from lack of light. nothing to worry about there, just pull 'em off.
The others do look overwatered or something, I really don't know.
I would recommend some cal-mag for those brown spots tho, it corrects common deficiencies.
This is what calcium def. looks like. you can judge.

Thank you!
 
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