Hydroponic Cucumber help!?

I am having a little trouble with my indoor hydroponic cucumbers (Boston pickling). Heres the info…
Room temp. is 79-83 I’m using a 10g recirculating bubble-ponics system with 30mins on 30mins off feeding cycle on using GH nuits in the "transition to blooming" cycle. Lighting is tube florescent 1/2 65k 1/2 27k. If the picture below wont work heres whats happening… Some of the lower leaves are starting to turn light green and spotting w/dry brown spots. the more sever leaves are dry and brown in large spots curing up and eventually dieing… It resembles heat stress or not being watered enough…. however I cant believe this as the new growth is CRAZY! these plants are growing and climbing at about 6in a day, and the new growth is lush and green. Roots are healthy looking and very large. I may be feeding them too much as cucs don’t really like too much water, however bubble-ponics are usually on all day…

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