Plants are enjoying the sun.
Will probably let them sit outside as long as its nice ans put them into the box, when it gets rainy / cloudy.
-- Summary --
Day 1: Planted into soil.
Day 3: As seen on pictures, one is growing slower
Day 5: The smaller one nearly catched up.
@FlatBrainGrower, a change would only make sense if you repot them to 20l pots. I would start with 11l or 12,5l Airpots the next time, but this is the maximum condiderung your tent size.