Good day
@NileOG
nice setup, and great job so far!
Agreed, at the 6.8 PH he would have had some nutrients unavailable. 5.8 (or 5.5) is the best starting point. Then do not correct the PH until it naturally hits around 6.3....then reset the PH.
Agreed, its a touch high. But depending as long as either H202 or benifical microbes are present, it's doable.
I aim for 19C-20C.
Nothing below 17C, as the plant cant uptake nutrients properly at that temp.
Many growers do aim for the 18C as you suggested. I always suggest at least 19C to give a small buffer away from 17C (if it gets too cold, it will look and act like a lockout making you chase your tail).
Above that 24C and you become close to having hot soup. I've done it- using copious amounts of H202. Not something I would recommend.
The other benifical part of a cooler reservoir is that at cooler temps, water holds onto oxygen better.
Thanks for the tag Bill.
My first recommendation is the addition of Cal mag.
I'd also possibly lower the PK boost. It may be too strong, the issue(s) were noticed soon after it was introduced.
And Nile, I also agree with Bill, I wouldn't defoliate any more leaves. Don't even pull the damaged ones until you have the problem fixed. Otherwise she will start pulling nutrients from undamaged leaves.
The damaged leaves will not heal.