just let those roots grow and hit them with 1/4 strength food the have just been trying to grow into a natural medium so the growth will be a little yellow untill the roots can get in that water
get a fan on them and i herd that the reptile lights only put off heat other than that your doing the best you can maybe paint some cardboard preferably wood flat white
go easy on the food 75% of what you are using give it water 3 times before feeding it again and if you happen to still be foilier feeding stop and whats your humidity