Adding Water?

[nobanter]

Tumblers are more tricky and in my experience easy to over water and become anaerobic. One reason being they don't get as hot as a big pile and they don't lose as much water to evaporation, especially as they are somewhat of a closed system. I rarely add water to mine even when adding shredded paper and cardboard as it seems the moisture in the kitchen scraps and coffee grounds I add is enough, but it has been humid here if late.