Penn-Plax Small World Aquarium Filter – Comes with a Disposable Media Cartridge – Safe for Freshwater and Saltwater Setups (SWF1)...

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.

Great little pump for small aquariums.

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 ZeeBooth 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.

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!!

LOVE THIS FILTER!!! I have a beautiful male crowntail betta. He had such an amazing tail but the filter that came with his tank sucked him against it and has ruined his tail. Also, the current it created made it impossible for my baby to swim. I have been on a hunt for a filter that wouldn't suck him up/against it, and he could swim with ease. He has a 5.5-gallon tank. I came across this filter and decided to buy it because it is really cheap and if it didn't work I wouldn't be out much money. It is easy to install (mine has a small issue with the bottom suction cup not wanting to stick but the top one stays in place and holds it tight.) and its current is perfect! (lower you place it in the tank the harder the current.) It has yet to suck him against it (I have had it for a month and a half and haven't needed to replace it yet), and he can swim with ease. It keeps his tank nice and clean! The air tubing does get a little grimy on the outside but you can rinse it off. Now for noise.. HARDLY ANY the only complaint is the little motor does like to buzz if it isn't placed exactly right. Now for suction... It does fantastic at cleaning but it doesn't always like to get my cats fur that he so graciously dumps in there while harassing the poor fish. I give this a 95%! LOVE THIS FILTER!