What kind of dirt are these in? Do you have any sort of nutrient for when they need it?
For free 1 gallons you can just cut the top off of a milk jug just stab holes in the bottom for drainage. Do not overwater. You can tell if they need water by lifting the container its in if it is heavy youll know it doesnt need water.
Watch those lights being that close. The humidity is going to be super low and temps hot. Give them a little breathing room until they have enough leaves to actually absorb all that light