Let's play, what's my deficiency

Hello growers,

I've got this malady besetting some of my leaves. I had a look at a deficiency chart but I can't be sure what it is. Can anyone identify the problem?

We need pictures of your entire plant and information on your environment, substrate, food etc..... to give you more than a guess.

My plants are asleep now, I'll get some pics tomorrow.

Plant is 1 wk into flower. Its "Jealousy" (i'm told). Its in a 7g pot, coco/perlite and is being fed "House & Garden" as per their own feed chart. In addition it gets a silica supplement (Aptus Fasilitor). Water is soft tap water. Tank ph is 6.0 with some drift to 5.8. Tank temp is 23 degrees celcius.

Room temperature is 25-26 degrees celcius and 53-57% RH with lights on. 21.5 degrees and 62% RH with the light off. CO2 is maintained at ~1400ppm.

Grows under a HLG 550 with 30w of far red tacked on.

I've minimal amounts of fungus gnats getting caught in my sticky traps.

Here are some wide shots of the plant. Majority of leaves are healthy.

Potassium

Could be lockout from excess though.

Thanks. I had a look at some potassium deficiency pics and it looks like a match. This started in veg so, its getting quite a bit more potassium now. Hopefully I've seen that last of it.