Aqueon QuietFlow E Internal Power Filters Small Black 4.69" x 3.75" x 6.31"

This is an amazing filter and perfect for my betta! I was worried at first due to the amount of noise it made that I would have to return it, but after 5 - 6 days it became very quiet. It's a lot better than a previous quiet filter I bought for my other fish and I will definitely purchase this filter again to replace my other bettas filter. I definitely recommend this filter!

Filter is very quiet and works extremely well. It keeps the tank very clean and isn't too expensive, as well as the replaceable filters.
The suction power, however, is a little too strong for my beta he always gets sucked into the current or pushed away from the filtered water flow (unharmed). Over all a great filter though, it certainly does its job.

This is noiseless! If you hear something it's because the inner workings are dirty or you don't have enough water in your tank. It is perfect for my hatchet fish and my cory catfish.... They like very little currant and not a lot of surface disruption!! It cleans the tank wonderfully!

The review criteria is asking for this black plastic pump's "sheerness". Like can I see through it? No, no I cannot but I think I can potentially live with that, so five stars for its sheerness. It's also asking for me to rate "suction power". Can it empty a bathtub in under a minute? No, but this thing is tiny. So a generous five stars for suction power. Also I'm being asked about its noise level. Again, tiny, not much vacuum, so mouse quiet. Five stars for noise level.
Sheerness... sheesh.

These are powerful little filters! After leaving them running for the first night they had disrupted the sand. No big deal as I later covered the bottom in rocks. These are my two side by side ten gallon tanks, you can see the size of the filter compared to the tank. I opted for the clips instead of the suction cups because my tanks have that black plastic border around the rims and if I had gone for suctioning them to the inside they would have sat too far in the tank and filled with water. The clips and suction cups are both included which is nice in case I need to use this filter on a rimless tank. All in all, great buy, no complaints!