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NICREW Slim Aquarium Filter for up to 5 Gallon Fish Tank, 42 GPH, 3W

  • Based on 3,027 reviews
Condition: New
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Availability: Only 5 left in stock, order soon!
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Arrives Sunday, Oct 25
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Features

  • Slim and compact design, hardly noticeable on the tank, great choice for nano and pico tanks up to 5 gallons.
  • Quiet operation with adjustable flow, doesn't overly disturb the fauna, perfect for shrimp or betta.
  • Patent pending priming system, auto restart if power is interrupted and restored.
  • Comes with everything you need right out of the box for easy setup and use.
  • What's included: Filter body, intake tube, extension tube, intake sponge, and filter cartridge.

Description

We are dedicated to making fish keeping easier and more enjoyable. We have extensive knowledge to help you to keep your fish happy and healthy. We not only provide quality products but also pay close attention to small details for a better fish keeping experience. Oxygenates water to promote healthier, more active fish while reducing splashing to make the return exceptionally quiet. Reduce flow for betta, shrimp, plant or other low-flow needs without compromising filtration efficiency. How to tell if flow is too strong for fish? Delicate fish (such as betta and goldfish) require a more gentle water flow, or they will show frank signs of stress. If the flow is too strong, fish will find it difficult to swim around and prefer to stay in one area or avoid a particular area. Used to lever the filter against the tank to make sure the water level in the filter is not at such an extreme angle as to cause spillage. Auto restart if power is interrupted and restored. 1. Use tweezers to gently remove the impeller; 2. Rinse the impeller; 3. Clean the impeller chamber; 4. Gently put the impeller back into place. Then try gently rotating the impeller by hand to make sure the impeller is free to rotate and prime the filter. Gently pull the intake tube to fit on the rim. Please note that it does not fit framed or frameless aquariums that are more than 0.4 inches thick. What should I do If the priming process doesn't occur? Verify that all parts are installed CORRECTLY and FIRMLY. Fill up the water in the filter case and fish tank as much as possible. Make sure the flow control valve is firmly installed and in the position of maximum flow. Does the filter tube extend? Does the water have to be filled to the top to use? Yes, it includes the additional tube to extend. It will be better to fill filter case completely with water before it starts. Otherwise, it will take some time to pump water up. (Water must at least cover the motor.) What if the filter doesn't start or makes a mechanical noise? Try to turn the impeller by hand. Check to see if something is jammed in the impeller. Rinse impeller and filter to remove blockage. Then verify free rotation and priming. Then verify the impeller is free to rotate, and the filter primes correctly. After a powerout, will this filter restart on its own? Yes, the motor will restart by itself once the power turns on. Can I use this in a turtle tank? It is not recommended for turtle tanks. Does this filter fit on a framed aquarium? Yes, you need to gently pull the intake tube to hang on your framed aquarium. The width between intake tube and housing is 0.4 in.

Product Dimensions ‏ : ‎ 3.5 x 2.9 x 7.3 inches; 11.29 ounces


Item model number ‏ : ‎ N83251


Date First Available ‏ : ‎ August 24, 2023


Manufacturer ‏ : ‎ NICREW


Best Sellers Rank: #3,371 in Pet Supplies (See Top 100 in Pet Supplies) #5 in Aquarium Filters


#5 in Aquarium Filters:


Customer Reviews: 4.1 4.1 out of 5 stars (3,027)


Item Weight: 11.3 ounces


Manufacturer: NICREW


Item model number: N83251


Date First Available: August 24, 2023


Item Package Dimensions L x W x H: 5.67 x 5.12 x 2.6 inches


Item Dimensions LxWxH: 3.5 x 2.9 x 7.3 inches


Brand Name: NICREW


Target Audience Keyword: Fish


Directions: Regular cleaning of filter and its parts every 2 weeks.


Color: Black


Size: 1-5 Gallons


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Oct 25

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Literally obsessed with this filter
Size: 1-5 Gallons
Firstly let me say this filter looks GOOD. I originally bought a very similar-looking filter from a smaller store but I definitely did not like how loud it was, the fact that they forgot to include the lid, or how damaged the box was. This filter is better in some ways, less sturdy in others. For example, the way the pipes fit together feels a bit cheaper. The filter runs better than the last one did, too, with a stronger flow, less sound, and better media. I really like this filter! It's genuinely probably the best filter I have had on any tank and it's odd that it was just a "cheap" nano filter lol. I've had a 26 gallon tank and a 20 gallon tank and two 5 gallons before, I've probably been through at least 8 filters, maybe 9?? This is the most well-suited filter for any of the tanks I've had in the past! For tiny tanks up to 8 gallons apparently. This one works very well for my small, planted 3.5 gallon shrimp tank! There are more things I could rant and rave about this filter but I'll end it here lol Oh, but also like that it was next-day shipping, like what??? I love having an Amazon warehouse ten minutes from my house ohmigosh 😭 ... show more
Reviewed in the United States on October 3, 2026 by Jay Kay

  • Works great for small tanks, quiet & inexpensive!
Size: 1-5 Gallons
This is actually my 3rd filter that I have ordered. I LOVE these little filters. I am use to Fluval filters, so the first time I ordered one of these, I was not expecting much. I needed it for a 3-gallon Guppy fry (babies) tank, so I didn't need anything fancy or expensive. I was pleasantly surprised. It was absolutely perfect! It cleaned the tank (bare bottom) well and did not fling my Guppies into the glass or try to give them a surfing lesson. The flow is adjustable from VERY low to full, so I can ramp it up as they get bigger/stronger. I also do not have to worry about them getting sucked up with the sponge intake cover on. The intake holes are relatively small, so if you are using this for a bigger fish or Betta, you do not have to use the intake sponge. I really like that it does not require priming. It is very quiet, so if you are keeping it in a bedroom, you do not have to worry about hearing the motor or splashing sounds. I then got 2 more 5-gallon tanks for more fry. They came with filters, but the output was way too strong. I ordered 2 more of these bad boys (or girls). The replacement cartridges are not expensive (6 for $9.99 or 12 for $14.99). It is a carbon filter, but it has a removable sponge on the back side to collect any larger pieces. You can replace the cartridge and reuse the sponge or use the new one that comes with it. I like to rinse it & reuse it a few times or use it to seed another tank. The filter itself is very easy to clean and it has a big enough area to add a little bit of your own media, if needed. I do wish that you could buy additional intake tubes. It comes with 2, but with fry, I like for it to go all the way down. That's no biggie though. If you are looking for a good (and cheap) filter for a smaller tank, this is the one. It will work great for fry, Bettas and other smaller fish. I promise, it will not disappoint. **These WILL fit on 5-gallon (and under) tanks with rims. My 3-gallon does not have a rim where the filter goes, but both of my 5-gallons do. It does not drop all the way down like the rimless tanks, but it drops down enough to hold it in place securely. All 3 of the tanks that I have mine on are Top Fin (Petsmart) tanks. ... show more
Reviewed in the United States on November 24, 2025 by Singleton

  • Nice easy to use filter.
Size: 1-5 Gallons
I love these little filters. They are so easy to use and have an adjustable flow - which is a must have with betta fish who hate strong currents. They're easy to clean and easy to replace the filters. Some people say they quit working within a few months, but what I've learned is that they works so well they suck up algae and the intake becomes clogged. Just take if off and empty it out and a big clot of green stuff will come out. Then they're good to go again. I have over half a dozen of these in various tanks and really like them. ... show more
Reviewed in the United States on September 17, 2026 by Melanie H.S.

  • Great item, great price
Size: 1-5 Gallons
Pros: • Great value, it’s durable and makes little to no noise • Easy to install, and cleans a 7 gallon aquarium great Cons: • Not the best overall filtration, especially biological. However, for the aquarium size this filter is intended for, this shouldn’t be much of a problem Overall, a great item, it’s lasted me a few months so far, maintains clear water, and it’s price is reasonable ... show more
Reviewed in the United States on September 27, 2026 by Lazaro

  • Second Times A Charm
Size: 1-5 Gallons
The first filter I received suddenly shut off when I used it for the first time. I could not get it to turn back on. The white propeller was also not spinning freely. I got a refund and ordered a new one which seems to be working great
Reviewed in the United States on September 22, 2026 by Anonymous Reviewer

  • Delighted with this CHOICE!
Size: 1-5 Gallons
Well, I was somewhat suspect because of the new product name and the price.The product displays excellent quality design and packaging. Actually smaller design than what I gad previouly. Easy to install and is very quiet. Replacement cartridges are very, very competitively priced. Looks like an excellent option. ... show more
Reviewed in the United States on September 7, 2026 by Mr. Breeze

  • Great -SILENT- little HOB for a smaller tank
Size: 1-5 Gallons
I am so happy with this HOB. I have two others that are this size but by different brands-the others are so noisy. This Nicrew filter is silent. It does a great job. It has an easy to use variability knob. It has a sponge prefilter (awesome to save flowy fins, baby shrimp or frog legs.) I am currently using it on a 4.12 rimless cube for a betta. ... show more
Reviewed in the United States on August 11, 2026 by J. Kennedy

  • Small and good product!
Size: 1-5 Gallons
Not the easiest/quickest to prime. I'd recommend replacing pre-filter. I modified the cartridge filter to use as a hold back for a custom bag filter. Very easy to clean!! Small size and limited water flow. Works well in my 4 gallon tank though.
Reviewed in the United States on July 17, 2026 by Billy M.

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