4 plants out of 6 are growing quite well, I only need 3 so it's alright. The growth is a bit slower than during my previous Sensi Seeds grow (if interested, see here https://growdiaries.com/diaries/157797-grow-journal-by-smokingtiki/week/869197). In my previous grow I was using a 24h light schedule so that's maybe the reason. The roots continue to reach the bottom of the pots. I increased the light power again.
Plants heights at the end of the week :
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Blackberry Cake 1 : 3cm
Blackberry Cake 2 : 6,5cm
Jack Herer 1 : 10cm
Jack Herer 2 : 10cm
Cashew Kush 1 : 12cm
Cashew Kush 2 : 2,5cm