Small, For Aquariums 4 to 20 gallons, EcoBio-Stones make aquarium tanks clear and healthy by keeping sufficient colonies of bacteria in your tank. Lasts for 1.5 to 2 years.
– Naturally revitalizes and clarifies aquarium water
– Assists in clarifying cloudy water, eliminating odors and creating a healthy environment for fish
– Keeps sufficient colonies of beneficial bacteria in your tank
– Eco-friendly and safe for all fish species and reptiles
– EcoBio-Block EcoBio-Stone Small