Brown spots/ Yellowing pics inc

Hello guys,

I have a 6 week plant whitewidow with a problem i cant seem to get rid off. Its getting brown spots on few leaves and kinda spreading slowly; im really concerned and this is my first grow. I have been doing some research and people say differnt things, such as chlorine in tap water, over fertilized or missing a nutrients.

I have to point out that I had definitely over fertilized and over watered it a litle bit, as i was trying to raise the feed. However its kinda hard to belive that the reason for the brown leaves is over fertilizing too - there are 1 or 2 leaves with nut burn apart from the brown spots.
I do not have a PH meter, i will get it tomorow so i can post the readings in here. Any help woud be highly appreciated!

And by the way, my soil is Biobizz all mix, fertilizer is Doff multi purpose feed, NPK 3.5/3.5/3.5, (i feed every 2nd wattering apart from once) and lights 4x 23watt CFL - 3= Daylight 1= Soft white
Thanks,
Maga0

chlorine in the tap water will not cause this, looks like a definate over fert. is good youre getting a ph meter, you can get a really cheap one at home depot that will measure lumens/soil wetness/ph.

oh and usualy good to allow the first two inches of soil to dry out in your container between waterings

thank you for your reply , ill be getting the PH meter today, and about the watering , i know :S i just get concerned hehe

The PH levels are 5.5 .

Because of the PH levels being 5.5 , Can it cause Nutrient Lock out therfore the brown patches ? , because i read it some where it can be P defiecy ?

PH went up to 6.2 and leaves getting better

infact the leaves are getting worse, and the brown spots spreading... any suggestions ?