some sort of wilt or virus? please help

i have grown many times with great success. but about 6 months ago a friend of mine got a shitty clone that infected about 6 peoples crops about 75 plants in all including mine. i have tried everything from sanitizing my room,to adding hydrogen peroxide to my resivour. i have an ebb and grow setup with 12 plants, with a 400 mh and a 600 hps doing the lighting,they get watered about 6 times a day for 15 min ea. time my ph is in the 6.2 range with 1000 ppm nutes. is there any sort of nutrient i can get to remedy this im about to quit growing im so frusterated. the three pics of budding plants are from a previous crop the root pic is from a recent grow.
 

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