Dr. moss Giant Marimo Moss Balls - Live aquarium tank plants low lightNo pesticides NATURALThe Moss Balls are live plants that remove nitrogen and phosphate from the aquarium, increasing water quality and removing algae by competing with algae for nutrients.. Fish excreta, debris, phosphate, and ammonia disturbs the natural ecosystem of the water tank. If the natural marimo moss ball is present in the water tank, they suck the toxic material. BEAUTIFULWith their deep green color, spherical shape, and easy level of care, Marimo are the perfect live aquarium decoration. 100% REAL MARIMOS  REAL MARIMOS ARE NOT ALWAYS SPHERICAL & MIGHT HAVE SOME BROWN SPOTS ON THEM --- As you buy Dr. mossMarimo Moss Balls, you should be able to differentiate between a real and a fake marimo. The 100% natural marimo will not always be spherical in It is perfectly ok to have some brown spots. LOW MAINTENANCE Marimo Moss Balls are without a doubt the easiest live aquarium plant; they require no special aquarium light, CO2 system, or aquarium plant fertilizer. Dr. MOSS prohibits the usage of dye that imparts artificial green color to the moss balls. 100% MONEY BACK GUARANTEE We are so sure that you'll be impressed by the quality and value of our Marimo pack that we offer a 100% Money Back Guarantee.