It would depend on the type of substrate you are using and how many frogs you are keeping. When you're dealing with live plants and a properly balanced substrate you can add in microfuana and the biological entities within the tank brake down and process waste so you only have to spot clean up random poo. Without those things the soil will foul and begin to smell. You can use a cricket bowl to help reduce dead crickets decaying in the substrate. Beside that I would probably change it out every 30 days or when it starts to stink.






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