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[mysnakesau]

For most carpets & water pythons they generally use 50/50.

I've heard Black-headed pythons, olives, womas and Children’s pythons eggs are more sensitive to moisture, so a drier 60/40 vermiculite mix is recommended. Or another thing I've heard is using a 50/50 perlite mix, as perlite holds a lot less moisture than vermiculite.

i got all this information from Southern X Reptiles website in their articles section. It is well worth reading.