are my babies in trouble??

hi everybody!
i'm new on this site so i beg you to be patient, cause i know after this post many of you will insult me... :spank:

i've been growing indoor 3 plants (low rider #2) in soil for 7 weeks now.
about 10 days ago i noticed that i was feeding the plants following hydroponics table instead of soils one...
i've started at 2nd week (since lights on) with "GHE" nutes (flora micro+ flora grow+ flora bloom); the amounts for hydro and soil were the same, so no problem here.

the 3rd week i fed them with 7/7/7 ml/Litres instead of 5/5/5 (as for soil) and the 4th week with 10/15/5 instead of 6/9/3.
as i noticed that i gave them only water for 4 consecutive days.
now they're having the correct amounts of nutes (6/3/9), but something strange is happening to the leaves: top leaves are getting yellow and dry while the stems are getting purple. moreovere today i've noticed that 1 leave has some brown spots on it. is anything wrong with them??

[img=http://img20.imageshack.us/img20/3620/immagine024dn5.th.jpg]
[img=http://img505.imageshack.us/img505/5185/immagine022sz8.th.jpg]
[img=http://img120.imageshack.us/img120/3508/immagine021gc0.th.jpg]


thanks for help