Exo Terra Moss Ball
Naturally keep unsightly algae out of your terrarium with the Exo Terra Moss Ball! Removes phosphates, nitrites and nitrates which help algae thrive. Each ball treats up to a 20 gallon tank.
Place Exo Terra Moss Ball in the water part of a terrarium/aqua-terrarium. Depending on water volume, replace with new Exo Terra Moss Ball every two months for maximum effectiveness.