As you can see i had some problems with those ladies, i've broken my PH tester and i had to wait a week for a new one, so it seems guessing the PH hasn't worked so well.
After two day of right fertilization, A and B seems much more happier than before, C is definitely strange; i'm trying to giv her a chance but i don't think she will survive
@SevenStoned,
and i even don't know why it's turning purple. She's a clone of my B plant who has grown just a big flower on the top, in a very small pot. Other plants are trying to turn purple though but i don't think they have so much time before harvest; let's see