what are u feeding them? b/c it can't be the water!
Edit: also post pix of the clutch. also if i were to go to non-paper substrate for hatchlings, i would go w/ a finer wood/fiber material like ReptiPrime/EcoEarth or even shredded aspen.
I bought a bag of reptile prime and let me say I'm not a fan. Imo I might as well dig up some dirt in the yard tbh