Repotted today in Schwarzerde with 20% perlite.
The leaves were already hanging over the edge of the pot and the roots had reached the edge of the pot. So I think this was the ideal time, even if it was a little early in their lifes (7 & 8 days old)
The tent is working wonderfully, temperature and humidity largely constant. 3 PC fans were installed for silent and energy-saving air circulation.
Also added an old nylon as a cover for the passive air intake because quite a lot of dust was getting in and possibly other life forms.
I hope they tolerate the repotting well.
Any advice or Feedback is highly welcome!