Potting soil?

[Zac]

Then additive free soil should be fine. As for changing it, it really depends on how dirty it gets, but as a general rule I would say every month or two. Ebony's the Bell Frog expert .

Hhmm.. Then what about Exo Terra's plantation soil? How often would I need to change that? Would there be enough for a 10 gallon (37 litre) tank from one packet?