Got a little advice for ya.

Lose the tinfoil, it's a lousy reflector.
A plain, white, wall is mo' betta.

Those kids appear to be under-lit.
Or they are getting too much red.

Get some breeze on them to thicken and strengthen the stem.

Re-seating them at this stage in those too-big pots is almost certain to damage young roots

Best to prop them up with a stick until they are ready to transplant, then drop them in a deeper pot and fill in around the stem.
It will usually grow more roots from the buried stem.

Aloha,
Weezard