Review on 🐠 Dymax Slim-Flo Aquarium Hang-On Tank Filter by Linda Rodgers

I bought two of these for 5 gallon beta tanks. They are compact and have a slow flow, perfect for a cockatiel aquarium. I didn't have any audio issues like others have said. I have one on my bedside table next to me and I don't even notice it until the water is gone. Then it's just the sounds of the water. My only issue with them is that removable media is ridiculously expensive. Buying 4 replacement cartridges will cost you more than the entire unit. I make my own filter media for about 0.25 cents to replace with pool filter media.