i'm just realizing the importance of light blockage, the kush seeds i sprouted are doing well, 2 weeks old and roots are already well in the rez...but after i added the 50% nute solution i saw a good amt of green slime (algae) growing on the roots and walls of the container. the only light that was leaking through was through the hydroton. thats prolly why your roots arent touching the solution. my plants are not even a quarter the size of yours and i have 10"+ long roots on all of them all white and healthy (minus the slime)...i'd say just flower em and see what you can get but for the next time make sure that rez is completely dark. good luck bro