That makes sense, I haven't completely automated my system because I anticipated it cutting off like you're describing.
I just manually check the tensiometer reading every couple hours and set my timer to irrigate for a set period (allowing for 20% runoff) whenever it hits a certain kpa threshold.
Bi-weekly microbe inoculation, tensiometer-based irrigation cycles. Basically pushing the plants towards generative growth.
I've noticed better root growth, ime, with straight coir as opposed to when it's cut with perlite and/or ewc.
But, yea, it's all about the irrigation cycles
10gal is a bit much for coco. Don't get me wrong, I've used 5s, 7s, 10s, and 15s with coir. But the best growth, ime, came with smaller pots.
These days I'll put moms in 2 gal pots and get em 4-5ft tall, hand watering as the terps described.
Mango is correct, unless a 2-3 gal rootball was...
Alright, I'm thinking ph may be an issue as promix is primarily peat (if I'm not mistaken).
Also, 63 degrees is a pretty cold, so that rules out heat. If it was me I'd set the fan to kick on when the temps get to the mid 80s.
The purple stems point to mag def, I'd use 1ml calmag in the...