Moss is a small green photosynthetic plant . so growing moss indoors will not only help to maintain humidity levels that don’t promote the spread of diseases, but will also serve to clean those disease particles from the air.
Terrariums are great for plants that require moist, humid environments. Succulents don't usually prefer these types of conditions. Because succulents use their thick, fleshy leaves and stems to hold water, they don't need moist, humid conditions.