Wide Application---Suitable for small fish tank and aquarium, and needs to be used with air pump. Suitable for shrimp tank, breeder tank, goldfish, discus, guppies, fry, baby fish or other fish. Create a Healthy Environment---Mini filter can improve water oxygen level, create a healthy environment for your fish to grow. It helps to stable water quality. Increase the oxygen solubility. Triple Filtration System---Cotton filters, quartz stand and high-performance activated carbon. Easy to split box and clean, it can replace the filter material, keep the water clean. Perfect Filter---It can clean sundries and stabilize water quality. Can cultivate useful bacteria that are good for aquatic pets. It result in a cleaner living environment for fish, particular they are useful for as breeding filter or as secondary filter. Easy to Set Up---Simply install an airline into the unit and turn on the air pump, great way to clean and oxygenate your tanks. Fix design of suckers, easy to install, convenient and practical.