vegetation leaf death with pics

I have a few types of plants and the only ones that are dying are my tomatoes.
They started dying after being transplanted to 4x4 cubes and have never recovered.
Background: 4x4 in hydroton watered once every 1-2days for15min
Of 600 ppm flora nova in 300 ppm tap water at 6.0 Ph. Under 400w mh 74f 45rh. Please and thank you for ANY advice!
 

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well it looks like its either to hot ( air), to much nuterietns, or the ph is off, try giving them water phed at 7.
if they were mine i would stop feeding for a bit
 
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