Root Rot!!! Leaves Browning!!!(pics)

So yesterday i got a lil browning on my roots
never have had this happen..
i have 6 clones and am growing in hydroponics
3 days ago i flushed my res. changed the nutes to
DNF and added some nitrogen def. that i bought
from a shop...it bubbled for some reason it seemed
weird but i didnt think it would affect it. i wake up
the next morning the roots are smelling terrible and are a lil
brown so i flush the res. put hygrozeme which i heard is a good
for root rot in hydroponics and put my nutes and today its
worse it seems...here are some pictures....

thank you to anyone who helps me through this !!!

http://i277.photobucket.com/albums/kk54/Keif_katcher/Picture031.jpg
http://i277.photobucket.com/albums/kk54/Keif_katcher/Picture034.jpg
http://i277.photobucket.com/albums/kk54/Keif_katcher/Picture036.jpg
http://i277.photobucket.com/albums/kk54/Keif_katcher/Picture030.jpg
http://i277.photobucket.com/albums/kk54/Keif_katcher/Picture027.jpg
http://i277.photobucket.com/albums/kk54/Keif_katcher/Picture029.jpg

i'm pretty sure the best solution is to get your reservoir temps lower.

how low, its at 68

maybe try raising your light?

my lights as high as it goes
there already in root rot
now i need to fix em.....
any suggestions??

not good man but i have a buddy who had the same problem just go through and cut all the really bad roots away then add like 1 tsp of bleach to a 10gal reservoir and change it weekly also add superthrive or some sort of vitamin supplement to help growth also it may sound crazy but ive heard if you play classical music around your plants it promotes new root growth everytime you change your water you want to thoroughly clean everything you can with bleach water pumps, hoses, trays ect... also look into hydrogen peroxide i have heard it will nuke it but i dont have personal experience read up on it though i think people call it h202 (chemistry) here.