Yep. My round leaves just fell off. About 3-4 weeks old - in ff happy frog soil. Feed 1/3 strength.Like pan head said though. Get that app. Then you don’t need to speculate on where exactly the light goes. I don’t feed seedling until the small round leaves (cotyledons) turn yellow. They contain all the nutes little ones need. 6 days sounds right. I was just going by the looks. Like I said they are good size for that age so your doing fine.