Check the listing for details. FLUVAL BETTA MOSS BALL - 1.8 IN. Condition: New. Listed at 8.99 USD. FLUVAL BETTA MOSS BALL - 1.8 IN The Fluval Betta Moss Ball is a product designed to improve the water quality and aesthetics of a terrarium or aqua-terrarium. It is specifically created to resemble a natural moss ball and contains a special absorption resin. This resin helps reduce the presence of various compounds that contribute to the accumulation of organic matter, leading to clearer water and reduced odors. The Fluval Betta Moss Ball works by absorbing and trapping phosphate, nitrite, and nitrate within its core. These compounds are commonly found in aquariums and can contribute to water pollution and the growth of unwanted substances. By removing these compounds from the water, the Betta Moss Ball helps create a more favorable environment for the animals and plants living in the terrarium or aqua-terrarium. To use the Fluval Betta Moss Ball, simply place it in the water part of the terrarium or aqua-terrarium. The frequency of replacement depends on the water volume. For maximum effectiveness, it is recommended to replace the Betta Moss Ball with a new one every two months. The key benefits of using the Fluval Betta Moss Ball include trapping phosphate, nitrite, and nitrate, acting as an effective deodorizer, reducing the accumulation of organic matter, and maintaining ideal conditions for the inhabitants of the terrarium or aqua-terrarium. Each Fluval Betta Moss Ball can provide these benefits for up to two months. It is suitable for use in terrariums or aqua-terrariums with a water volume of 30-60 liters (10-20 gallons).