Hello everyone!
This is my first grow, i am doing white widow. The girls are on week 4 of flower.One of the plants fan leafs are starting to turn purple. I read alot of different things about a phosphorous def. however i am running the advanced nutrients lineup. Also using ffof, and 2 marshydro 600 watt. In a 3x3 tent. Any help would be greatly apprecaited!
Welcome to the forum, great community here. I think you have enough pics, but fill this out. Is it on all plants, or just the one? What stage was the plant w/o issues in? Before the issue?
COPY/PASTE the below list into your forum post.
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so; Or post
NA (non applicable)
Always try to upload a clear picture of any issues you may have to allow the community to assist you.
Add anything else you feel would help us give you a most informed answer should be included. Feel free to elaborate, but short and to the point questions and facts will help us help you in a more efficient manner 
Thanks!
Please be as complete as possible. If soil please tell us WHAT soil. WHAT light etc. It’s all important.
Thank you doing it now
Everything was going great no issues. Until this 4th week of flower! It is also only on 1 of the plants!
Cold temps early and late in flower will bring out wild colors. Could be the culprit, also I have never grown in coco but I think 6.5 maybe is pushing it with your ph again I’m a soil guy but I think the highest people like to go is maybe 6.1 or 6.2 with coco.
Also welcome to the forum glad you’re here!
Thank you for your reply! Im suprised only the 1 plant has it. You would think they all would then, if it was cooler temps?
@Hellraiser @kellydans @MrPeat… thoughts? I usually don’t tag people, but we’re both growing WW, respect!
That’s why I mentioned your 6.5 ph level also this plant might be starting to show deficiencies earlier due to higher Ph levels when you’re watering.
I have always double checked my ph. I am also using ph perfect nuts, from advanced nuts.
You did a lot of due diligence before starting, it looks great, hopefully not a serious issue. I’ll be using Advance Nutes on my next grow.
I’d go with the cold temps bringing the wild colors. Also could be genetic to that pheno of WW, I’ve grown tons of WW and came across a pheno that went purple and had very purple buds. I called it Purple Widow.
People paid extra for that. Plants look healthy, wouldn’t worry about it.
Thank you for your input! This is my first grow and have put countless hrs of research. Dont wanna lose it now!
First welcome to the community ! overall I think your plant looks good color on the leafs as mentioned could be from colder temperatures. I usually get some color on leafs with a Winter Grow. Lights out sometime temperatures get a little low. Verify pH meter check runoff. Good luck
For your next grow, I’d go with Happy Frog over Ocean Forest in flowering at least, much more friendly with the AN nutes.
I can see those low temps could cause the colorization in the leaves. My plants stay green till the end whwn I stop feeding nutrients. 
