Penn-PlaxSmall World Aquarium Air Pump and Filter Kit – Comes with a Disposable Media Cartridge (Bio Sponge, Carbon, and Zeolite Crystals), Multicolor, 1 LB

I did alot of research for slow flow betta filters and seen this one highly recommended and for the cost I ordered two sets for both my bettas. When I first hooked it up, the flow was crazy fast and I was so sad.. didn't even set up the second one because I was ready to return. I didn't see the part that you can add to the tubing to adjust the flow. Once I found that part when I set up the second one, I was AMAZED. Bettas don't like fast flows, almost no movement is their preference because more can stress and tear them up. This filter works amazing. I can slow it down to barely a bubble just enough and my bettas are so happy! I would definitely recommend these over any expensive pet store filter!!

So I read a lot of reviews people complaining about noise, which if u buy the kit with the air pump it is super quiet. Then people complained about not being able to take the thing apart to clean. I mean for $7 a month I can replace the cartridge. The power is controllable which is nice as it doesn't suck my betta fish in like most filters do. People complained about it making there tank cloudy but I rinsed it really well and ran it for 15 minutes in just a bowl of water to get any excess gunk out and it worked just fine. Didn't make my water cloudy at all. And with in a half hour of running I could tell the water clarity was getting better. I think this is a great filter for my tank which is 1.6 gallons and didn't come with a filter. Very small doesn't take up to much room in his tank. Also filter replacement is very easy. You just pop it out and stick a new one in.

My small fish tank filter takes these refills, which are more affordable than most other ones. It works great and takes up minimal space in my small aquarium. I also have made other Amazon purchases from this same company/seller. I am very pleased with everything. Update - I lowered the filter rating to 4 stars because of my most recent purchase, in April. I thought it was just the packaging, but when I opened it, the filters already appeared dirty. I realize some of the filter stuff could have gotten on the white material, but it should not have been that much. Hopefully, the filters will be ok for regular length use.

Perfect for my one gallon tank and it makes no noise. Instructions were clear. I’m excited to finally limit the amount of times I’m having to clean the tank

After having numerous problems with waterfall filters that suck up small fish and tadpoles, I found this product and would not have any other filter. I use it for my 10 gallon tank and it works very well. All you do is connect it to your aerator. There is no suction at all and no waterfall to toss my small fish around. It cleans the water and provides oxygen for your aquatic buddies. The filter cartridge is visible, so you know exactly when to change it. Not all pet stores carry this product, but it is well worth it to order the extra cartridges online (as you can find it for the same price you would in stores even with shipping). When I accidently threw away the cartridge holder, I went out of my way to find it again for the safety of my fish. However, if you have live tubifex worms, they will make a home out of the filter if it is too close to the ground so I recommend placing it high in your tank. But if it does happen and you don't want to kill them, slowly move the filter out of the water over the course of a day or two and they will wiggle their way out and back to the gravel. But anyways, I would definitely recommend this product for anyone.

This filter is awesome! It is one of the best filters out there for small aquariums less than 10 gallons, esp. since it is a bubble filter which produces very little friction to the water surface if you add a flow control valve between the tubing. Another top option for small aquariums is to use those very small sponge filters or corner filter made by Xin You brand.1/19/16: My 1st review posted December 28, 2015 is shown above & gave it 5 stars. Now I have here my 2nd review on it, I'm giving it 1 star. I originally thought it was an awesome filter for small aquariums less than 10 gallons. After just about a month of use I had to clean it and then found out something about it that really made me mad- you cannot take out the foam to rinse it! This makes it incredibly hard to fully clean to re-use which is why they sell replacement cartridges. However, I think throwing away the cartridges is extremely wasteful since they don't look cheap and will cost you a fortune if you throw them away after each month. I would instead maybe buy 2 or more extra cartridges and cycle through them. Would have to find a more effective way of cleaning the filter sponge inside other than swishing it around in a small bucket. Anyone have any suggestions? Anyway, from now on I'm going to stick more to miniature sponge filters for my smallest tanks.

This filter is the perfect size for my 2-gallon fish tank. I attached the air pump with the back flow connector because it would be sitting lower than the filter. All I am getting are a few bubbles through the filter, not what I expected. Also, does anyone have any tips on how to keep the tubing connected to the items on it? I just can’t seem to get the tubing on far enough.

I really like these little filters. They are a good deal and very easy to change out when dirty. I have a small 6 gallon planted tank with some little critters and this filter does the trick.

This was a great filter in a 3 gal. tank! I had a Betta & it worked well. I now have a 5 gal. tank & it got dirty quickly-every week. I highly recommend in a smaller tank!

Aunque el filtro funciona bien encontré decepcionante que el cartucho se haya diseñado específicamente para impedir su reutilización. Hubiese sido perfecto si el cartucho permitiera a los consumidores que pueda ser llenado con lo que se necesite para aumente su valía.

Very good.Quality, price and delivery.

This is nice little kit for small tanks up to 5 gallons. Come with everything you need to get started, easy to use and setup. Cleaning and replacing the filter cartridge is simple. Air pump output is great and is very quiet, you hear the bubbles but not the pump.

Hace bien su función de mantener el agua limpia en peceras de bajo litraje, también bien oxigenado el agua, solo que efectivamente, es como de cartuchos y si siempre se va a tener si hay que comprar repuestos, pero de allí en más todo muy bien.