PULACO Ultra Quiet Aquarium Hang on Filter (66GPH 3W), Small Fish Tank Filter for 2 to 8 Gallons Fish Tank

This gentle filter is perfect for my 4-gallon shrimp tank. I've got a pre-filter sponge on the filter inlet to prevent the shrimp from getting sucked in. It's very low power/flow, so it takes a while to prime itself when you turn it on (back on after it was off), but it works well enough and is great for a nano tank. It's pretty much silent (at least as far as I can tell in a room with a bunch of other aquarium equipment running all the time).

Ideal for a small 10 gallon tank. No compliants for the price.

Muy buen filtro en relación al precio, tienes lo justo por lo que pagas. Súper silencioso. El diseño podría estar mejor pues el agua fluye por encima del material filtrante en lugar de hacerlo de abajo hacia arriba, la abertura para el paso del agua es algo angosta y alta, nada que no se pueda modificar un poco con algo de habilidad. Tiene muy buen movimiento de agua, un poco mas del que realmente necesitaba pero con el ajuste de flujo al mínimo me funciona bien.

Broke after 3 weeks of use on my 7.5 gallons. Motor seem to have overheated. For the sake of your fish, invest on another brand for your filter.

I cannot speak to the longevity of this filter, since I have only used it for two days now. I understand that some of these reviews state that it dies after about a month. I hope that is not the case. However, I can confirm that it is unnoticeable, as far as noise is concerned! You cannot hear the motor or the impeller turning. You have to focus and strain your ears to hear anything at all. If you do, it is the movement of the water which you hear, not the filter! And the look and construction is simple! There are no fancy curves or obstructing attachments which would make it difficult to clean. Since I discard the black block of foam that is provided (as the only filter media) and replace it with a name brand filter pouch, it obstructs a little of the inbound flow which results in a minor back flow into the tank. This is irrelevant to me as the majority of the water flows through the white filter pouch and the carbon that is inside the pouch. I buy size M filter cartridge (from that popular name brand), discard the blue or green plastic frame, pour the silver packet of carbon into the white pouch, rinse, roll it up and wiggle that tiny "burrito" vertically into the section where the black foam was supposed to fit. I also have a sponge filter running in my little three-gallon desktop tank, so theoretically, I have addressed physical, chemical and biological filtration. I don't know if this is overkill, but it's just what I do. My sponge filter is set to flow very slowly just in front of this "hang on filter" in an attempt to diffuse the water flow... because this filter is STRONG. I would never put a betta into this environment! Not even if I diffused the water flow with a mountain range of rocks! That's how strong this filter is. This filter can easily match a five-gallon tank, of course, depending on the species and quantity of fish you are raising. If I had a handful of small fish in a five-gallon like danios or minnows, it's perfect. It just depends. For example, I would indeed use this filter for a fighting fish if on the gentlest flow setting, in a ten-gallon tank, and the tank was heavily planted with live plants. My little tank has a thicket of anubias and Java ferns and 7 Rummy Nose Tetras. I know. Overcrowded. But they are fat and healthy. They get partial water changes twice a week! Altogether, I love this filter. My water is pristine!