Potassium issue

[Growbizz]

Hey guys! My plants are facing a pottasium issue with my baby. Can you please help me on how to go about it? I've tried flushing the medium and a little defoliation.

 

[Growbizz]

Growing in unbuffered coco/perlite . I have realised that's a mistake. It's my first time. Using AN lineup. Some cheap LED lights. The room temp is around 26 and RH around 60.

 

[MaskedPlants]

Hey buddy,
Can you fill this form so we can help you out better?
Also, what's your feed and runoff EC and PH?

Problem:

Medium/grow method:

Feed: and supplements used:

water source:

Strain/age:

light used:

Climate:

Additional info:

 

[Growbizz]

Problem: Pottasium issues

Medium/grow method: Unbuffered coco/perlite

Feed: and supplements used: AN grandmaster grow kit

water source: Ground water - 5.7Ph and 55 PPM

Strain/age: Sour stomper / Mephisto

light used: Cheap LED lights

Climate: 26 degree celsius and RH 65

I feed at 5.8 - 6.0 PH and 400 PPM. She's on day 43 she was stunted due to this issue