HITOP Diameter 4in Aquarium Bio Sponge Filter: 5-40gallon Air-Powered Fish Tank Filter, Quiet Filter for Aquarium/Betta Tank/Shrimp Tank/Fry Tank

Good investment and works well at keeping the 10 gallon tank clean and oxygenated. It's been in use for a little over a month now. We have guppies, mollies, a pleco, snail, catfish and they all seem to be happy. This sponge filter replaced a tetra carbon filter that was bulky and you had to keep purchasing the replacement filters for it. So we consider this sponge filter set up as a win win. It's easy to clean and reuse, works great in the tank, has a dual purpose, doesn't take up that much space and comes as a pack of two! A good tank solution for filtration and air.

My new favorite sponge filter! These are well made and do have the air stone in it so the bubbles aren't big and disruptive. I bought the small size, one is perfect for my little 5 gallon.

This is a Great Buy. You get a filter and bubbler all in one piece. I don't know how the smaller one is...but I bought the larger one for my 3 gallon cherry shrimp tank and with the tiny stone black gravel and a couple of real plants....It looks WONDERFUL, absolutely no noise and works GREAT!

I like that it comes with air stones, and I didn't need to customize it to get an air stone to fit. This works as any sponge filter should. It has a round sponge design, which is unique. It is semi course, not quite as course as Aquarium Co-op, but more so than many in this price range. The supplied air stone is the normal 1" style. You could run a higher quality stone, if you have a big pump to really get the air moving.All the negative reviews are strange. Seems people expect a sponge filter to come with a pump??? This thing is like eight bucks, lol.The base is weighted and will sink once you saturate the sponge. It comes with a short length of air hose. I prefer silicone, so I didn't use it.I have the 40 gallon rated sponge in a 29 gallon tank with 2 Penquin 200 hobs running. I also have 2 of the larger sponges in my 55 gallon with 2 Penquin 350s. I have one each of the smaller sponges in my 10 and 20 gallon tanks with Aquaclear hobs. If you are running this as your sole filtration, I would go double, at a minimum, if you're running it in tandem with an hob, running to size should be fine. (I would literally run 2 of the 40 gallon rated sponges in a 20 gallon as stand alone filtration).

Needed oxygenation for my 75 gallon tank. i ordered the product along with the sinking sponge filter things :-) Comes with 2. i am only using one at this time as it suits my needs completely. Relatively quiet and plenty of power that can be turned down. sinks to bottom and looks nice n the tank compared to most i have seen. seems to being my fish to life with the added oxygen in the water :"-)

They keep floating up on my tank, would not stay down!

Way to big for my betta tanks still works though.

These are great for small tanks. Easy install and easy clean. Also work great. Awesome price and great seller