I wouldn't suggest pellets of any sort. They don't offer stable
footing for development of leg muscles. Imagine walking on
a surface that constantly gave in an unpredictable direction
each step. Like the other post said, dusty and very prone to
mold. On any reasonable sized enclosure they require a lot of
pellets which are heavy to deal with and dispose of regularly.
I tried it once in a 300 gallon tank, I needed 2 big bags to
get a thin layer and it was a fiasco not to mention the dust.
Luckily that was at the old house, not here! lol!
My absolute favorite bedding when my tort was small was
Lizard Litter Kenaf Plant variety (never use the walnut shells),
I really liked that stuff. Mine's outside 24/7/365 now but
if I had a hatchling that's what I'd use.