Leaf on Colas Please take a look

If somebody could take a please look at my leaves. This is a sativa dominant 9 to 10 weeks flower I'm in week 5 to 6. If I had my own opinion it would be from too much potassium. I try my best to pH the water 5.8 to 6.5. not all of my plants are doing this.

CidreSpy said:

If somebody could take a please look at my leaves. This is a sativa dominant 9 to 10 weeks flower I'm in week 5 to 6. If I had my own opinion it would be from too much potassium. I try my best to pH the water 5.8 to 6.5. not all of my plants are doing this.View attachment 4311879 View attachment 4311878

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Looks like stress, not potassium.
Could be the light is to close. If the light is to close high temps and low humidity would increase the stress.
If you started from seed plants will have different levels of tolerance to these things.
That would be the place to start.
What type of light?
How far from the canopy of the plant is the light?
What are the temps and humidity?

I was getting the same thing on a few upper leaves that were very close to my light. Moving the light up another 8 inches or so cleared up the issue.

I totally agree heat stress. My 600 watt HPS Hortilux might be a little too close.. thanks! I'll put down my bong long enough to move my lights up a few inches. @Kushash temps are unknown usually less than 28c at the top the of the canopy in tent with the cool tube. Humidity is also unknown typically whatever is in my house or outside of the moment Things I can't really deal without any climate control in my house. I just measured those leaves in the photo are 14" from the CoolTube 16" from the Bulb.. You think I could be better I've been doing this for just over 10 years and I totally lost my old account rollitup I had to make this new one today I want my old one back.

Heat stress is the first thing I thought when I saw it.