Potassium deficiency?

[Pinball123]

Hi guys so I’m 23 days in on my first attempt and the research Iv done suggests a potassium deficiency the genetic is critical cheese Iv used coco with some perlite and dry 444 plus 30 percent 284 and ph between 6-6.5 please chirp in with your opinions trying to learn as much as possible obviously I’m doing something wrong