You are supposed to trim these so there is only one seedling per slot but so far I haven't had the heart. I added extra 'nutrient tablets' to the water yesterday so maybe that could help a little, make up for having too many plants stuffed in each tiny space.
I thought that having the light so far away would never work, and thought they would be spindly and leggy. But they are amazingly robust. And I might add, they are much bigger than they would be at 3 weeks in soil. The literature said it would be that way but I guess it still surprised me!
Here's a current pic as of today:

Not bad at all!!
PJ