Small, For Aquariums 4 to 20 gallons, EcoBio-Stones make aquarium tanks transparent and healthy by way of keeping enough colonies of bacteria for your tank. Lasts for 1.5 to 2 years.
Naturally revitalizes and clarifies aquarium water
Assists in clarifying cloudy water, getting rid of odors and making a healthy setting for fish
Helps to keep enough colonies of really useful bacteria for your tank
Eco-friendly and secure for all fish species and reptiles
EcoBio-Block EcoBio-Stone Small