I need to save these

How do I save these plants.
Here I am again. We never fixed my problem from last time. i really want to save them this time.

600wt lights
Cocoa / perlite mix and
Floating roots watertable.
GH flouro
RO Filter
69 t0 78 degrees
Ph 5.8 to 6.4
Plants get thriving and kikn butt. About a month into bud when everything looks awesome they begin to mimic Mg deficiency. The brand of nutes don’t seem to matter. The more nutes I have the longer it takes to develop the problem, but now my nutes are at the peak i can give em while the problem grows. The leafs that see any light start to get little spots til the outer vainal areas bleach and the leafs die. I'm looking from the underneath now and the spots are like transparent. I can see the light thru the spots. Soon i'll be able to see thru them. What it is is the whole plant seems to just want to frign die with deficiencies almost suddenly. I have been having this happen too many times now and I seriously need help. I thought I had it figured out when I dosed heavy with cal mag and they thrived. Til now. AGAIN! I'm now folier feeding with epsom salt. Another forum friendly person mentioned airborne toxins. They’re symptoms were like mine. I did find some toxic vapors nearby and removed it a day ago. I kinda hope that was it. I’m tired of staying up late trying to salvage this once easily grown weed. I have one plant in the last few months that doesn’t seem to notice. It was an experimental the was in 3 gallons of soil then put in a 5 gallon with cocoa and perlite. I treat it like a hydro plant. And feed it floronova full strength. It looks slightly over watered like expected.
But how do i save the others? your time spent will be really appreciated and Karma will pay you off some day.

do you flush?

Got pics! check it!

Ya usually, but last run i flushed and dropped the nute level to help this and they died. Also the water table i use doesn't need to flush and I have the same problem there. That eliminates allot of possible problems.
Thanks

You should've added this to your mix:http://www.google.com/products?hl=en&rls=com.microsoft:*&ei=vdglSoSLKKSUtgPK9_mNBg&resnum=0&q=espoma+garden+lime&um=1&ie=UTF-8&ei=wNglSvKbBKf0tQO0n8jLBg&sa=X&oi=product_result_group&resnum=4&ct=title .Especially with cocoa...

1kooguy said:

You should've added this to your mix:http://www.google.com/products?hl=en&rls=com.microsoft:*&ei=vdglSoSLKKSUtgPK9_mNBg&resnum=0&q=espoma+garden+lime&um=1&ie=UTF-8&ei=wNglSvKbBKf0tQO0n8jLBg&sa=X&oi=product_result_group&resnum=4&ct=title .Especially with cocoa...

Click to expand...

Would it have prevented this? Compare this to just four days earlier.

Follow up.
Air Toxicity is real. My crops are back to normal after a year of stress and torture. Do not let your plants breath toxins. If it doesn't kill them it will compromise the quality. Air toxicity resembles Mg deficiency. Mg is used by the plant to help get rid of toxins. If you have Mg deficiency signs and you believe you could have had your plants exposed to air toxins(in my case it was painting supplies) you can try to increase the dose of Mg. It will help but it may be two late. It took my plants over two weeks to show improvement but it was too late. I had a 30% harvest.
Thanks to all who helped me with this even though no one guessed it, and I hope this will help someone in kind. Feels good to be back.

After all this. OZONE Generator in room. I thought it was an ionizer. Toxicity was an issue but the Ozone was getting in the water and on the leafs. Give me a week I think I'll have it confirmed. I confirmed I'm stupid so far.