Second week was a struggle. They stopped growing and cotyledons turned yellow. In my opinion because of the combination of too low ec soilmix (plagron pro) and pH problem.
That’s why I decided to transplant them into their final pot and soilmix (Plagron Promix + perlit + Mycoterra F1 Supersoil amendment + Mycoterra Kraken MG).
I think they are over it now.
Testing the Blumat system which seems to be working so far.