Random Stream of Consciousness

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.
So she took about 4 Gallons before hyper run off. Had a strip test left and you’re right @Laughing Grass looks like 4.5 ish.

Never had P lockout before so this caught me off guard a little.

Guess we’ll see how she’s doing in the morning.
 
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