Oh, you mean peat moss. Safe as long as no fertilizers. They sell "organic" peat. I know breeders from a long time ago that incubated eggs in peat moss before the alternatives were widely used.

A cheap and totally safe alternative is coir. This is sold as bricks. You have to soak them in warm water, you probably know what I am speaking of. I know it seems pricey, but it lasts a super long time between changes and 1 brick makes quite a bit of loose substrate. Plus completely safe, even if eaten. Does not mold either.

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