Live Moss

Live moss is suitable for any tropical vivarium or terrarium. The moss is shipped in a dry, dormant state, but will spring back to life when exposed to bright light and moisture. Live moss is a great accent or substrate, especially in dart frog vivariums. It will help to process waste in the vivarium, as well as aid in maintaining humidity. Live moss is soft and non-abrasive, and will not harm the delicate skin of an amphibian, unlike many reptile substrates. Live moss should not be used as a substitute for leaf litter - that is still the best option for ground cover in a tropical vivarium.

Please read the following article on growing moss in a vivarium:

Growing Moss Like A Boss