Thank you for your suggestions, I was definitely not patient enough to wait for the true leaves to appear. Ty for suggesting rook wool, I tried starting seeds in plain LECA, but I guess that was the wrong decision. Ty, I’ll invest in some rockwool :)

If possible, could you help me figure out how often should I change the solution? I’ve heard many versions, but generally it’s every two weeks, tho I still have question, should I change the whole solution or just add new one on top? If it is possible to add a new solution to the existing one, is there any rule I should follow to mix it?

Ty for your response! Sadly, two seedlings are already a bit dead, weirdly one is standing strong lol