A week full of struggle but it’s a new set up, new experiment so I am not somworried about it.
The first trouble (leaves curling down, purple stems) that looked like magnesium deficiency or overwatering was -imho- due to low humidity. Since the CMH light is on temperature went up, RH dropped to 30 %.
So I installed a humidifier, but I needed few days to get it. And I also put the light higher.
By now they look much better, even though after trimming them (creating a manifold) Grape Juice produced some strange signs:
The 2 big fan leaves she had turned upside down for a day and some yellowish spots appeared on them.
All in all I think they are doing well. My first time to do mainlining, so I am really curious about the outcome. I am planning to do the “Nebula way”, so two cuts, eight colas.