Jardin 2-Piece Plastic Swing Tail Fishes for Fish Tank, Yellow/Green

I have tried different vendors sponge filters and now have them in all my tanks. I like that they operate quietly as the add more oxygen to the tank. They are easy to use and keep the tank cleaner and my fish healthier. It is easy to clean them and economical as you can reuse them and only need to replace about every six months. My fish and shrimp also enjoy eating the food that catches on them during feeding time. They have made fish and water creatures so much easier to care for. I will keep purchasing them and recommend them to others.