Kisal, you are, once again, my hero !
I have around 14 seedlings at that size in the container, but it's the only one that had it. The hood is removed, and i don't think it going back on if i risk loosing one of my little guys
(ps. it's hard waiting for them to grow bigger!! so slooow)
I'm total new to the "cacti-world". I just planted my first cacti in March, so i don't know anything yet.