Random Stream of Consciousness

As you wish…

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Have you gotten a PH meter yet?

Looks like some mite damage but it's minor. Are they staying very wet? I'd love to know your run off ph.
I have a PH pen coming from Amazon later this week.

They aren't staying wet. Feed every few days, same as the others. The PG is flying and seems any MG progression has stopped. Call that a win.

It's been a strictly MaxiGrow and Cal Mag diet.
 
Recommend protocol?

Since you're not in flower this is more likely a lockout than a deficiency. Sweet spot for phosphorus uptake is between PH 6-7. Promix is acidic so I suspect your rootzone ph is a little low. Do you water to run off? When you get your pen, water to get enough run off and test. If it's super low... 4-5 I'd water at a PH of 7 to bring it back into range.

Personally if I were to ever run promix again I'd do my first couple watering at 7 just to bump it up a bit.

This is so early that you can solve this long before it goes into flower.
 
Recommend protocol?
What is the volume of your container? Flush with that amount of your regular full strength feed. Then feed every day to some runoff. You have low pH in your root zone locking out P. Your plants don't take up npk at the same rate so over time, without sufficient watering, things get wack, one thing builds up and locks out the other. It's not what you put in but what's left behind. Drybacks exacerbate this. Stepping down from my soapbox.
 
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