Believed Potassium Deficiency

I am growing in soilless using pura vida 2 step aggressive formula. 2 days ago I noticed yellowing on the edges of some fan leaves. The leaves have also been curling for some time. I then thought it was a Potassium Deficiency. I bought Diamond black and watered them yesterday. Today I wake up to find little has changed. Do I need to give more time and potassium rich feedings, or should it have been cured after one feed? Could it be another deficiency or lockout?Thank you

So you post multiple threads for this "emergency"?

i love when people over fertilize thare plants . gee wiz thare over fed lets put in some more nutes and way over doo it, to every new growers (read the directions) on fertilizers