Hang on filters are designed to be clipped onto the back of your aquarium.  They are ideal for small aquariums where space within the tank is limited.  

Key Features:

• Suitable for aquariums up to 40L
• 180L/HR
• Flow regulator which can be used to adjust the water flow through the filter
• A combination of wool, carbon and biogrid which provides a complete and very compact filtration solution and is easy to replace
• Excellent oxygen levels achieved due to its design
• Includes step by step instruction guide
• 2 + 1 Year Garuntee