Mastery Knowledge Needed.

[Waira]

..... As you said, Promix is soilless, and as such utterly devoid of nutes; that root product is pretty rich, an odd 5-15-5 too .... In any case, it's not the right NPK ratio for this stage, and doesn't have a complete nutritional profile of secondary and micronutes,... Symptoms are a bit ambiguous, can't say what's defc. for sure yet... But I'd get on proper grow nutes ASAP, along with Si, humic-fulvic, and inoculants, ASAP..... keeping the soil herd diversity and populations up helps a great deal...
Also look into getting a good soil pH probe for in-pot measurements, run-off testing is bollocks! The Accurate 8 is a good less $$ unit (love mine, been a choice tool for me), or one of the more trick units like Blue Labs has (basically a modified pH meter, with all the PITA care and maintenance that entails)... Even with that run-off reading being dubious, it shows you are likely a bit too acidic in there (promix should be about 6.2 or so),.... pH adjust your inputs to 6.5 to help get in-pot pH up some,....

 

[RivetGrrl]

..... As you said, Promix is soilless, and as such utterly devoid of nutes; that root product is pretty rich, an odd 5-15-5 too .... In any case, it's not the right NPK ratio for this stage, and doesn't have a complete nutritional profile of secondary and micronutes,... Symptoms are a bit ambiguous, can't say what's defc. for sure yet... But I'd get on proper grow nutes ASAP, along with Si, humic-fulvic, and inoculants, ASAP..... keeping the soil herd diversity and populations up helps a great deal...
Also look into getting a good soil pH probe for in-pot measurements, run-off testing is bollocks! The Accurate 8 is a good less $$ unit (love mine, been a choice tool for me), or one of the more trick units like Blue Labs has (basically a modified pH meter, with all the PITA care and maintenance that entails)... Even with that run-off reading being dubious, it shows you are likely a bit too acidic in there (promix should be about 6.2 or so),.... pH adjust your inputs to 6.5 to help get in-pot pH up some,....

You asked for the master and he appears You are in good hands.
I don't wanna hear about runoff being bullocks tho I can't afford to buy a decent in-soil pH meter on top of my Blue Lab
But it looks like a great unit to own for sure.