You may wan't to create a little ecosystem in the terrarium.

To achieve this, it is important you don't overcrowd, that is one of the reasons you have to give you're frogs an appropriate sized tank depending on species and/or amount that is going in it.

I always put springtails and different tropical woodlice in the tanks.
The waste the frogs produce, dead leaves or dead flies etc. may be taken care of by the janitors.
In their turn, they also provide a brilliant food source to you're frogs, while cleaning you're viv, brilliantly planned by nature i think

Using life plants also has a benefit.
Life plants will take up nutrients from the soil,
prefending it from heaping up and potentially doing harm to the frogs.
Beside that, they help maintain a good humidity as well.

The only thing i do now and then is changing some leaflitter, cleaning the windows and clean the feces that are stuck above ground or something,
just for the visual