First Grow, Need some help identifying the problem

[Yes-007]

Hello, first time posting, also first grow. I've got some weird colouring leaves if anybody could help me out it would be much appreciated. Quick run down of the set up, soil, 30L pots, 600w light on 12/12. On roughly there 5th week of flowering.
Also here's a shit picture but it shows the problem theres a few like that on one out of three, thanks in advance.

[Mac]

Welcome to the talk

[Krofam]

welcome to the talk bud.

are you getting runoff when you feed? if so, what percentage comes out to what you put in?

30ltr pots seem a bit overkill to me.. i imagine youd need to feed 10+ltrs to get any runoff.

i would flush through with just ph'd water for a week or so ensuring you get a good runoff each time. id say around 20-30% then go back to normal feeding but with an EC slightly lower that what you had before.

then always aim for 20-30%runoff every time you feed

[Greengrass]

What temps have you got and how's your air flow?
Looks like a bit of tacoing going on like it's defending itself
Atb chap

[GEORGE]

Welcome to the Talk Yes_007, enjoy dude.

[CityDweller]

Welcome to the talk.

Looks like she is hungry. Either do to a lack of food or root zone ph imbalance preventing nutrient uptake.

Are you feeding or just plain water grow? Any idea of the water PH or EC?

[Yes-007]

Yo thank you for the help. Been keeping it basic as just thrive flowering food with water every couple weeks but only since flowering.
Temp wise probably lowest is just under 10, then upto 25 degrees when the lights on, pretty good air flow as it is but also got a floor fan and an extractor fan going all the time.

[Quotientcatalysed]

Every couple of weeks lol should be couple of days.

[Yes-007]

Cheers for your input mate, Huge help to everyone aye! definitely be coming back to you.