It is normal. A little nitrogen deficiency. Are you using straight water. Even if feeding, normal till roots form. i use this guys rockwool method with great results. He also has aeroponic method I have not used.
https://www.icmag.com/ic/showthread.php?t=268211
Looks a little humid for day 8. Do you open vents and take lid off for a few minutes a day? Are they in rockwool?
What's best temperature for the room to get them roots