I am no expert and am probably wrong. But I am going to guess Calcium deficiency or lockout.

Upper leaf
Small spreading dots
Lower leaves look better

A zoomed-in shot of the underside of the leaf would help rule out fungus.

Good luck!

Are you using Cal / mag in your feeds ? Od .

Here’s the underside. I’m not using calcium. Using a mix of tiger bloom, big bloom and grow big.

threatco said:

I am no expert and am probably wrong. But I am going to guess Calcium deficiency or lockout.

Upper leaf
Small spreading dots
Lower leaves look better

A zoomed-in shot of the underside of the leaf would help rule out fungus.

Good luck!

Click to expand...

The new pics don't look like fungus to me. Still thinking Calcium. And since the leaf tips look mostly pretty good, I am guessing it's not lockout from overfeeding.

Since you say you have never given them cal-mag, it may be time to consider that as the most likely remedy.

Do you know the ppm of your tap water? Or have a city water testing report on dissolved solids? If you can show low ppm or low calcium in tests, then I would feel pretty good about recommending you give them some cal-mag to address the issue.

Damaged leaves will stay damaged, but if you check the same leaf over a week, you should see no new spots if that fixed it.