Superfish Bubble Deco refrigerator Funny and useful, that's the Superfish bubble deco fridge. Connect this refrigerator with a hose to an air pump and let the bubbles with oxygen spread through your aquarium. Adding oxygen Safe for your fish and the aquarium ecosystem. Suitable for freshwater aquariums Size 7.5x9.5x10cm Superfish Bubble Deco refrigerator requires an air pump (not included). We recommend an air pump from HS Aqua, for example the HS Aqua AC85. Place the air pump above the water level to get air. Before placing in the aquarium, rinse thoroughly with tap water. Never clean with chemicals, residues can be dangerous for your fish.