PH Problems

i have a sick marijuana plant and have decided to create a post for some advice on what to do. first of all i created a post before about problems with my marijuana plant and had somebody tell me that i had problems with my ph. however, i read a post in a forum saying that marijuana ph automatically corrects itself if everything has been ph corrected before feeding. first of all i would like to say that if this is the case then why is my plants ph messed up because my last grow i used the same techniques, soil, water thats been left to sit, and the same nutes. i am wondering if my plant is lacking all of the nutrients it needs as i cut back the nutrients for a while (maybe too long) due to all the problems i was getting as i over fertilised. could anybody reccomend what i should do? i have started to feed the nutes again as of yesterday but don't want to start feeding the plants again if this is going to make it worse. part of me thinks that feeding the nutrients again will solve the problem in time but i'm worried my plant will get worse and be too late to sort out if this isn't the problem.

another thing i should say is that the plant desperately needs a new pot, i think its using a 33cm wide, by 30cm deep pot and the plant itself is only 2ft high. why is the root system so big, and whats the largest sized pot i should get to make sure i wont need to repot again? i'm hoping to start budding as soon as the plants better! i've also done a ph runoff test with a paper ph test kit and the ph colour shows about 6.5/7

cheers for anybody that can get me out of this mess, i've never really had problems with my plants

anyone????

6.5-7ph is ideal.

Next time try to format your question better, its very long and unappealing to the eyes.

post a pic of your plant, and i might be able to help.

If i need any additional information after ive seen the picture I will ask.

Hello.

what strain?

hydro? soil?

what nutes? how much nutes? How often?

You have pictures?

What do the plants look like?

How old are they?

what are your temps?

what is your humidity?

What kind of light do you use?

flush the plant with straight water ph adjusted to 6 ,,, then feed as you normally would , and yes get it into a bigger pot , if its root bound you wont harvest half as much as you should , would be best to transplant into the bigger pot then do the flush as when transplanting you use straight ph'd water anyway

bigger pot = bigger roots = bigger bud

thanks for the reply people, sorry its taken so long to reply...
white widow
gorwing in soil
hesi nutrients, recommended strength is 10ml/2 litre, but for now i am only using half of that, and giving it nutes every watering.
the plants are about three months old now, i'm just waiting to get them healthy again so that i can bud them
temps and humidity i'm not too sure about as i have no metres to read them.. yet! but i guess theyre about right.

Thanks for the help you three! lets hope we can find the problem soon!