Side shoots appeared. Might have a Iron / Magnesium deficiency. Will check towards end of week 4. Started with Nutrifeed. 3g / 5L.
Added Fe-phosphate as ground topping before adding water. Light distance to be increased to 70 cm at end of week 4 (06 May 2019).
Current distance +- 25 cm.
Watering: Every 2nd day. Have increased water amount. Top soil wet at least 3 cm deep.