Nutrient deficiency, cant identify (potassium?), need some help

so my 3 ladys on my balcony have been showing some deficiency signs, and i cant seem to be able to identify what it is. ive checked the the deficiency thread but cant pinpoint what im missing.

3 plants. in rather large pots. fimed into nice bushes. outside on my balcony. i water them with 10 liters every 2-3 days.

i noticed like 1-2 weeks ago. single fan leaves at the bottom yellowing/browning (not like nitrogen, its different) also it seemed to ma as if they where stretching slightly.

here are some pic from when I first noticed:













so i got a ph checking kit and started checking my water... water was to high (somewhere from 7-8 i guess... it kinda hard to tell judging by the color of the water :/) and i started correctiing it down to like 6 - 7 and since i though that i may be a potassium deficiency i gave them Hesi bloom instead of their normal grow nutes a couple of times.

it didnt get better. the following pictures are from like 5 minutes ago.


overview:







Stretching? (the one in the black pot seems to be doing the stretching more then the others)






Pictures of the progressed leaves in the next post (10 image max.)

this leaf is little higher up (early stage?)


same leaf


this leaf seems to have some kind of full blown necrosis going on... pulled it of to get a decent picture (was a fan leaf a the very bottom, only one affected in this way)



man im sooooo good at taking pictures.... but yeah this is the same leaf that has the necrosis thing going on...






different fan leaf from the bottom Yellowing progress with fullblown papery necrosis from the tips

Anybody have an idea what this could be? im thinking maybe it an combination of multiple different things? im kinda clue less what else to try... i check the ph.... gave them a couple of watering with plain water (ph adjusted), gave the some hesi bloom instead ot theirs normal grow nutes for a couple of waterings... im all outta ideas... i kinda have to figure out what it is if i wanna fight it and right now im just speculating wildly...

Your early stage picture looks like the damage is starting from the inside. I think a potassium deficiency is supposed to start with the edges. Some of your symptoms do match up, though. It can be really tricky, I've been in the same boat for only a few days with a less progressed problem...

I think potassium deficiency is just barely starting to happening to my plant now, which is a rather large, sturdy bush and still growing fast. (image below) I'm in a very large pot (100 gallons) and it had been quite some time since I fertilized, a whole month, before symptoms started very slowly with only the lowest, larger fan leaves. None of my more recently fertilized, smaller plants have this (again another indication of K deficiency since large branchy plants use more.)

If you have been fertilizing regularly then its a lot more likely that you need less of something than more.

Today I also found the red/purple speckling starting on the petioles of the lower leaves that are affected, which I believe I've read in some guides is another symptom of K deficiency, maybe check for that too.