It's growing very nicely under the lights. Now I can see new growth everyday, which unfortunately did not happen on my balcony.
This week I gave it a watering with a grow tab from Royal Queen Seeds Easy Combo Booster Pack.
I gave up on lst for now, maybe i'll try again when it's a bit bigger.
Also I found a caterpillar, first pest issues arising? Hopefully this particular issue was easily solved.