Hey bud I skimmed threw your thread a bit fast..
Was just really looking to see if anyone has tried to help you yet, and from what I read its more people chimming in saying get to soil then actually trying to help.
First I would like to comment on the way the plant grew. You got big stretchy thin plants because in the start you went right to 12/12 with undeveloped clones. also the amount of light you had when you first starting contributed to the extreme stretch, They will stretch regardless when you put em to 12.12, and without enought light, they stretch even more. Next time I will think you should give em a few weeks to veg. At least a week. That way the plant can grow out some vegetative growth to aid later on in flower (more leafs = more engery being able to produce) Also will give time for the roots to grow into the new media. From there I will like to comment on the PPM's you were running in the start....DONT TAKE THIS AS THE WORD OF GOD but when you start with clones it should be something like this
Say for the first week run around 200ppm's for the clones, Kick it up once you see them to start growing, maybe like 600....let me have fun in that, if your gonna do like a three week veg Ill get em up to 900 ppm's in the most aggressive veg stage. Ive even had my veg plants on 1200, but they were big enough to handle it and they loved it! Just remember to keep eyes open, Running more then one strain in the same hydro system can lead to problems too, One strain might not require the same nutrient levels that the other does, which can result to one thriving and one dying. Then when you start to flower you need to switch your bases up. Giving less veg and mroe flower nutrients. I wont get into details ,but you can learn alot about which nutrients are more needed in each stage of growth threw the forums, A must for any hydro gardener. Once you run flower nutes, and the plants can handle say 1200 ppm's , its not unheard of in the last few weeks to get plants on up to 2000 ppm and above, just learn to read the plants, and if at anytime they start to burn, flush em with some clearex and add water to your rez to lower the PPM's. I know im kinda throwing this at you all at once, Mostly just hitting the harder and more important topics.
Right now Its good to say your well on your way to growing sexy plants! Just had to adjust your systems and get in tune with it.
As for the bottom leafs yellowing, Its normal for the very lower leafs to yellow and die, Just the way of life...as for them bigger leafs getting rust and what not, Its a under / over feeding problem, and without being there when It happened i cant comment on it.. Oh and remember to watch your rez temps, if the water is too high or low in temps it will cause a lock out and the plants wont be able to absorb any nutrients. I had about 1,000,000 things i wanted to tell you when I started this post, but now i can think. and I wanna smoke,, So if you would like me to add to this or you have specific questions you need answered , send me a private message or reply to your thread, I subscribed to come back and check later this week, So im here to lend some advice if you ever need it.
If ya got 30 bucks to spend I reccomend getting edrosenthal's book, the marijuana growers handbook, You;ll never need this site again! LOL
Take care
book