Answer by
Qwitzon (578)
These are tanks for keeping newts, salamaders and other semi aquatic animals. It comes from paludal-- meaning of the marsh and "arium" as in aqu-arium (aquarium). These are containments that replicate the conditions in a marsh or swampy region. People tend to be self-sufficient-- the plants in the system keep the water relatively clean. They do not require much cleaning.