Tetra - Whisper 4I Power Filter 1-4gal

Designed for tanks up to 4 gallons, Tetra's Whisper 4i internal aquarium filter is ideal for smaller aquariums in need of superior filtration and quiet operation. Designed to adjust easily to low or high water levels, the 27GPH pump circulates a 4 gallon aquarium more than 6 times an hour. Two-filter design Whisper cartridge floss catches debris and waste, while ultra-activated carbon takes out smells and any discoloration. Space-saving design can be mounted inside your aquarium, flush to your tank's wall. Includes lid, tank clip, filter and cartridge. Requires Small Whisper filter cartridges.