AQQA Aquarium Sponge Filter 5-20 Gallon Fish Tank Filter Air-Powered Small Aquarium Filter Whisper Bio Sponge Bubble Filter for Breeding Fry Shrimp Betta Fish Tank (Small for 5-20 Gallon)

This is a nice alternative to using air stones or bubblers if you want the added benefit of filtration. It is however, too big for my 5G, so the product description is misleading in my opinion. In such a small tank, one must be ever aware that anything added to the tank, such as rocks, aquarium filters, etc., will reduce the water volume, and that then factors into the bioload. It's better suited for a larger tank, like my 20G. To prevent it from lifting up, I buried the base in sand with some rocks around it. To make it less obvious, and to not distract from my aquarium's fish and plants, I planted some Amazon sword plants around it.Of note, it does not come with an air pump.

This filter has been working great for me! You only need to supply the air pump and hose. It was already set up in the box, I just rinsed and installed it. The airstone works great with lots of small bubbles. It's quiet. The small size fits my 5.5 gal tank perfectly.

I got this small bubble filter for a small tank. With the set up I have, it just pumps out too much air for my fish to feel comfortable with it. I plan to get a smaller pump to see if this might help. The box does not come with any tubing so just be aware. For a different setup, I think it would work great.

Exactly what I needed to keep my shrimp from getting sucked up. Relatively inexpensive and works well

I got this for my fish tank but didn't realize that you need to supply your own air pump to get this to work so was unable to use it. I do like the size and the utility of it, but just a warning to others that you'll need to have your own air pump to connect to it.

a solid choice for aquariums ranging from 20 to 110 gallons. This ultra-quiet, submersible filter serves both as a mechanical and biological filter, promoting a healthy environment for your fish. The sponge provides effective filtration while also offering a habitat for beneficial bacteria. It's easy to install and maintain, fitting neatly into the corner of your tank without disrupting the aquatic setup. Its quiet operation ensures minimal disturbance to your aquatic life and environment, it’s a reliable and efficient filter that offers great value for its price.

The listing says: "HEAVY DUTY BASE, WON'T FLOAT: The upgraded aquarium sponge filter features a heavy-duty base, so you don't have to worry about floating anymore!" except this is false and it absolutely floats. I've stuck some of the suction cups from my tubing to the side to try it stop it from going up but it's now just lopsided, which is super annoying. It's a decent filter, but it floats so it has to go :/

I like this filter as it is small and easy to place in the corner of my fish tank. It filters the water and aerates the water with air bubbles. Quiet operation and only hear the bubbles. The base is weightedand hold the filter in place while operating. Nice attractive water bubble effect during Operation the filter comes with thorough instructions, 2 extra sponge filters and a 1 year written warranty.

So after finding an adequate air pump to use, this little guy worked great. There were some concerns about not being heavy enough to stay in place but it was not an issue.Using it in a shallow tank to help with aeration and filter and it is doing the job nicely.Quite happy with this.