I used sand in the brooder for my first and second batches of chicks and the chicks raised by momma last year were on sand from the time they hatched. None of mine overate the sand, but I had the feeder and waterer set up on a paper towel in the brooder the first day, so maybe that made the difference?
And they LOVE, LOVE, LOVE having things to climb up on! I use a heating plate, so they would hop up and roost on that. Plus they had a roost made out of a tree branch - loved that as well. They graduated to a 2x4 roost and have been sleeping on that ever since.
Anyway, glad to hear all is well!