Day50: Some leaves have a reddish tint, the trunk is very reddish.
We have the intuition it's a lack of Ca and Mg, so next watering will be with these two minerals.
Day 53: 5l dispatched between the 4 plants, Ca 1ml/l BLOOM 2,5 ml/l
Day 55: 9l dispatched between the 4 plants, Ca 1ml/l BLOOM 2,5 ml/l