For him, it's about 3" thick. For my colubrids and ATBs which are also all on reptiprime, about an inch and a half. My corns and king will make little tunnels in it and push it around. The ATBs don't really care and still just use their perches and hides.
I wanted to make sure his was deep enough to really bury himself since that's a natural behaviour for these guys.
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