So after 4 days the seedlings were like:
And after a few more days they got longer, but too long and didn't stop longing for the light so I bought a (cheap) grow light:
but I guess was too late, so today I threw them in my backyard
and started anew:
this time with only 10 pots of cabbage and 5 of cauliflower, cause I was reading and realized that my previous attempt was not actually feasibly for a family as mine of 3-4 people to eat so much as it would have been harvested from it, unless you give the stuff away or put it to pickle.
I also bought some beneficial flowers plus Rucola (arugula) seeds, I went in my lunch break at the flower market in Amsterdam, I was also looking for spinach but could not find that time.
Lets hope now it will grow stronger seedlings this time!