Cleaning Pacman Tank

[Jello737]

I am new to keep amphibians, I mostly have reptiles and arachnids. I just adopted an albino pacman frog, which ive always wanted! Now my question is how often do I clean the tank and how...
I know to change her water dish every other day.
How often to stir up substrate to prevent fungus? How often to completley change the substrate? I have coconut fiber/moss mix.
Thanks for any advice! Glad to be a part of this forum