nute burn question...not what your expecting

Ok so a few days ago my one plant started to look a little light compared to the other...then I noticed they havent been growing as fast as they should...then the one that was a little light started sagging...the next day or so the tips of the leaves started curling but not browning...yesterday it started to brown on the tips..but also yesterday is when I found out I was having nute burn...I am not sure if its because I used to much nute or because of the spike in PH(I had the ph go up to close to 7 then I would drop it and it would go down to about upper 4ish)...but I did the steps to try and save my plant...the whole time my other plant hasnt had any problems but now its starting to yellow...I wanted to post up some pics(not the best) to see what people think...and to see if everyone thinks there recovering...should it get better with what ive done..any other reccomendiations
..I also cut the brown dead looking roots off after my peroxide flush

pics...
1) setup
2) yellowing plant form a few mins ago( just misted the folage)(plant 1)
3) other plant thats been fine(plant 2)
4)close pic of yellowing plant(sucks...sorry)
5)saturday which was day 14
6)plant 2 on day 14
7)pic of both plants on day 14
8 )plant 2...day 15
9)grow setup day 15


My setup is a bubbleponics setup from ebay and my lights I am using 4 55watt CFL's...my grow room is a spare closet which is 6x6x3


also I am noticing under where the branches are i have 2 very very little v shaped things..are the plants trying to show there sex??

As the plant ages the leaves will turn yellow die and fall off naturally your plants look fine goosefraba and be gentle with the Ph rollercoaster..your nit picking stop it leave ur plants alone let them do their thing lol

Ok...so its just me...whew!!...well I feel better now thanks...this is my first grow this far...my first two attempts I would get sprouts to just get the first set and die since I didnt have enough light...I also just noticed that both plants have just sprouted there first set of 5...Im so happy

thanks again for the help Bauks

Plants at this stage often don't look super healthy. Generally their newly rooted cuts and they're just getting their legs back. Give them a constant ph between 5.5 and 6.0 and a ppm of bout 400 or 500 ppms.Give them a week or so for new growth to start and the you can boast the nutes to 600. You're better off lower than higher on the nutes. To find the perfect nutes level for your plant you'll need to experiment. When your water level lowers due to your plants respiring and your nutes stay at the relatively same ppm (being used at the same rate) then you know you've hit it on the dot. Stability and consistancy are the keys to good plant health. It will also make your work a lot easier when you don't need to make adjustments daily.