These Sponge filters are great for small aquarium and provide both mechanical and biological filtration for your tank. They contain a ton of surface area for beneficial bacteria to colonize. They are perfect for shrimp tanks, nano fish and fry grow-out tanks. These come in two sizes, small and large.
The small has a sponge size of 3.2 inches - perfect for a 5 gallon to 20 gallon aquarium.
The large has a sponge size of 4.5 inches - perfect for a 29 gallon to 40 gallon aquarium.
