Hello,
I've got Sphagnum moss in the wetbox, were my snakes hide when they prepare to shed.
To get rid of any bacteria or parasites, I found out you can microwave it. But be careful, it's very hot afterwards.
I think it can be used, as long as it doesn't smell funny and you can't see any fungi growing.
I changed the moos last week (after 2.5 months). Better save than sorry.
Greetings,
marike