The Damn sour problem....HELP PLEASE

Well the probe thingy does show something lol. The water I use is 6-6,5. I just used the soil and some perlite... I definitely think it's iron def cause of pH, though I'm not sure how should I deal with it

Whats your soil? this is the root of the problem maybe get it? And if so you need to amend it. But not knowing what your using is gonna fuck ya in long run when you have problems. Are you saying you just scooped up dirt from a field or ditch? If so you have no clue whats in it. I'm not saying outdoor soil from somewhere wont work but bringing indoor you need to have a lil knowledge on what its acidity is or if its alkaline. And other things like ph, NPK of soil. Was it good black dirt?

do you have any cal mag in your nutrients? def overwatering tho. you hsould fertilize every toehr watering and do not wter until the top 1" of soil is dry

I bought my soil, it's 6,5 or so pH. I don't give my plant any nutrients... And I water rarely after everyone saying it's overwatered... I'm doing LST I have a homemade CO2 can and my girl is growing fine... heres a picture of today The only thing I'm worried bout is her color.... I'm trying to lower the pH of my soil to like 6,3 so it could absorb zinc and iron because I think that's the case... Also I made 3 clones from her 2 are like 9 days old at the moment . i'm not sure if this one's ok, what do you think?

Your ph is off, and it is probably from you trying to mess with it, unless it is some messed up soil to begin with. I would consider re-potting into 'known' soil or a promix soil-less type medium. If you have to start fucking with the ph in a soil type medium you are fucked right from the beginning. I see peeps that chase their ph 'tails' for entire grows, no thanks!
Also, insufficient light will turn out weak looking plants like that, may I wager a bet that you are using just a view cfl's ganja brother?!

yeah I thought the same all along, been trying to make it right... My ph is better now cause the plant seems to be better. Well I'm using only 120watts atm, will add more sometime soon, will definitely add more during flower, maybe a hps.

over watering looks like. let her dry out for 2 days atleast

most of these deficiencies can be solved by using rainwater, ill rarely see deficiencies in outdoor grows. if you continue to see deficiencies, use micro nutrients as well as the regulars grow nutes your using. sythetics aren't the way to go if you've already burned them imo, so look into buying some bat guano or other organic nutes.