Week went quite good, though some troubles :
Temperature : had a few days at 18° day and night, this might have slowing them a little. But mainly still the same temps : 22° day and 18° night.
Watering : now every day instead of once each two days. Same nutes used.
Bringing the lampes higher to maintain 60cm height.
One of the girls had a leaf twisting. After seeking the reasons (watering etc...) found out it was the heater. It was blowing the hot air straight to her (which was a very bad idea). Moved the heater a few times before finding the right place.