I'm looking for good ball python substrates, So far I've tried cypress mulch and josh's frogs coco husk, but they only last me 1-3 months and I have to buy another bag.
What are some substrates that last a while? I'd like something that would last a couple of months, Maybe something I'd only have to buy a few times a year.
My terrarium is 38x18x15 inches.


Thank you!