NICREW Aquarium Internal Filter, Submersible Power Filter with Multiple Function for Fish Tanks 2 to 5 Gallon, 40 GPH, 3.5W

I’ve been using this small internal filter for a few weeks in my 5 gallons tank and it does a good job. It’s compact and easy to set up, and doesn’t take up too much space inside my aquarium. The flow is gentle enough for my fishes but still keeps the water moving and super clear. It runs pretty quietly too, which is a big plus, but it is not completely silent either. The only thing to note is that you’ll need to clean the sponge fairly often since it’s small, but that’s expected with a filter this size. Overall, it’s a reliable little filter for small tanks. Great value for money.

Works great for my 5.5 Gallon tank, I actually modified it some in which then it works even better, inside the filter is a plastic basket that holds a small pouch of carbon, the basket has small holes, so I actually used the Fluval Zeo-Carb loose in there, it is big enough that nothing escapes! Works great! Then I trashed the little pre filter that comes with this, I felt it had large pores which let a lot through, and I got the Fluval Phosphate filters, and I cut them to size and put them as the pre filter, I think it makes it one of the most efficient filters I've ever had, and it SUPER QUITE I love that if I keep it just slightly above the water as it sprays from the long attachment it creates some bubbles, enough that my guppies are super happy, which is good because typically bubblers are very loud.

I bought this filter at the beginning of January, so I’ve been using it for almost 3 months now. Overall, I’m really happy with it and I feel like it was a great upgrade for my tank. The filter feels like good quality and it has two types of filtration that work really well together. One is a sponge that catches most of the dirt and debris, and the other one is like a bag with filter media that helps clean the water even more. Together they do a really good job. Before this, I had a waterfall filter that came built into a rock decoration with my tank, and honestly it never worked properly. The water was always dirty no matter what I did. After switching to this filter, I immediately noticed a huge difference. It only took about 15 minutes after turning it on for my tank water to look clear again. This filter is rated for 20 to 40 gallon tanks, and mine is 20 gallons, so it fits perfectly and has more than enough power to keep everything clean. The only downside is that it does make some noise, which can be a little noticeable at night. Also, I had some bad luck because the replacement piece for the motor propeller came broken, so that’s why I’m not giving it a full 5 stars. Other than that, it’s a really good filter and I would still recommend it. It keeps the water very clean and works exactly as expected. Also, my turtle actually loves it and likes to sit under the water flow, it even looks like she’s dancing when the water hits her shell.

I recently purchased the filter for my 10-gallon aquarium, and after a few weeks of use, I feel compelled to share my thoughts on this compact device. As someone who values both functionality and tranquility in my fishkeeping experience, I've found this filter to be a mixed bag of brilliance and overpowering performance. **Pros:** 1. **Compact Design**: The size of this filter is truly noteworthy. It fits seamlessly behind my aquarium decor, allowing for unobstructed views of my aquatic inhabitants. 2. **Whisper-Quiet Operation**: One of the standout features of this filter is its near-silent operation. I often forget it’s even running, which is fantastic since it’s in my main living room. However, if the bubblers cap is removed It will make noises so I wouldn’t recommend doing that. 3. **Easy Installation and Maintenance**: Setting up the filter was a breeze. The instructions were clear, and it took no time to have it up and running. Cleaning and changing the filter is straightforward, which is essential for someone with a busy schedule. **Cons:** 1. **Too Powerful for Small Tanks**: While the filter’s strength may be beneficial for larger aquariums, I found it to be a bit too powerful for anything under a 10-gallon setup. The water flow is strong enough that it creates a significant current, which can be distressing for smaller fish and plants. I've had to adjust the outflow angle to try to minimize the turbulence, but it still feels excessive in some parts of the tank. 2. **Limited Flow Control**: I wish there were a more effective way to regulate the flow rate. The filter operates at one speed, which can be overwhelming in a small tank that needs gentler filtration. Overall, the filter is a fantastic choice for those who need a small and quiet filtration solution, but potential buyers should be mindful of its potency. If you're using it in a larger aquarium or are keeping more robust species that can handle higher flow, this filter might be a perfect fit. For those with delicate fish or plants, I recommend considering whether the strong current can be adequately mitigated before making this purchase. Despite its power, I’m still pleased with my overall experience and will be keeping it in my setup for now.

It’s a neat little filter but makes a humming noise, louder than others.

Works great in my 2.5 gal pico reef tank jar, has room in the top where the charcoal goes for some bio media and circulates the water enough to keep the cyano at bay. Macros and zoas like it.

Works really well in my small tank. I have been having issues with a cloudy tank and I have tried everything. I tried this filter and as soon as I installed it, my tank became clearer and I haven't had issues with cloudy tank since. I recommend it. Super powerful for such a small filter.

Bought for a 5 gallon hospital tank. Like the design, simple and easy to install & maintain. Stopped working after about a week. Customer service suggested I clean it. Wasn’t really dirty but it started working again after I reassembled it.