To recommend our pick of the best internal aquarium filter, we first have to understand the term “internal filters” and how they work.
Internal filters, otherwise known as internal power filters, work in likewise fashion to external power filters. The difference is that an internal aqua filter is meant to be submerged inside aquariums.
The way it works is this: water is drawn through the filter chamber by a water pumping and then is purified by different types of filter media.
Most aquarium internal filters use foams as the primary mechanical material and often a cartridge with activated carbon to eradicate organic wastes dissolved in the water.
Internal power filters offer a good replacement for internal sponge filters and air-driven box filters. They can accommodate a bigger share of filter media for better filtration and less maintenance.
They are also easy to hide from view using plants and decorations in the tank, so they do not ruin the ocean feeling of your aquarium.
Beginner hobbyists love to use these filters because they are very easy and simple to install and clean.
Best Internal Aquarium Filter Review
Discover the best type of aquarium filter for internal use. Here are some of the top recommended internal filters for small to large aquariums.
Marina I25 internal filter for small tanks up to 6.6 gallons
This clip-on water filter is perfect for small tanks with up to 6.6 gallons of water. The filter works on a spectacular mechanism that allows water to get into the center of the cartridge. This allows the internal filter to eliminate toxic and odor ammonia in the water effectively.
It is one of the quietest aquarium filters you’d find online. It is so quiet that you can have your tank beside your bed and not worry about the noise.
The Marina I25 power cartridge is worth the price and is a powerful filter. It comes with a zeolite chamber, activated carbon chamber, and floss layer that respectively perform mechanical, biological, and chemical operations to purify the water and keep your fish healthy fully. In addition, changing the cartridge is quick and easy that needs to be performed every four weeks.
KollerCraft TOM Aquarium Mini Internal Filter
This is yet another product you need to test in the market and cannot regret buying. KollerCraft is a company is based in the United States and is the first company to design the desktop aquariums.
Since it began operations in 1941, the company has witnessed a huge spike in customer growth. As a result, they now accommodate other accessories for reptiles, cats, and even dogs.
The filter is compact and can handle 10 to 45 gallons of water per hour. Plus, the flow rate of this filter can be easily adjusted too.
This product comes with a spray bar that allows you to produce even water flow. Fish parents select this type of filter because it is simple to hide inside the aquarium.
It is recommended for desktop aquariums and NANO tanks. The product dimension is 6″ x 3″ x 8″, and it weighs about 10.4 ounces. It can be used either in a vertical or horizontal position. If you would like to brighten up your aquarium, then try the KollerCraft filter!
Tetra Whisper 10i in-tank filter for tanks up to 10 gallons
This quiet in-tank filter is well-suited for small aquariums holding up to 10 gallons. It makes use of a medium Whisper bio-bag cartridge and a patented Bio-scrubber pad to provide a three-stage filtration.
The Whisper bio-bag cartridge is a floss pad filled with activated carbon to rid the tank of waste particles, discoloration, and odors in the aquarium water.
The Bio-scrubber pad creates the house for good bacteria to colonize and performs biological filtration processing nitrogenous toxins from fish waste and uneaten food.
Installation of this top internal aquarium filter is very simple, using suction caps included. You can place the filter at low or high water levels as you want.
It can also be used as a waterfall for low-water tanks or turtle tanks. Maintenance and cleaning up is simple as ABC, too. The bio-bag cartridge needs to be changed often each month.
Fluval U4 underwater filter for 34-65 gallon fish tanks
Tank owners will love this in-tank filter for its large filtration chamber and stronger performance like external filters.
This particular internal filter is recommended for tanks mounted against the wall or any other configuration that would not work with external filters.
It is an efficient and silent solution to keep your fish healthy and happy at the same time since it offers optimal biological filtration. You can use it as a supplemental filter or stand-alone filter for a bigger tank.
Fluval internal filter comes with two foam pads that take care of large particles, two carbon/poly cartridges, and 90 grams BioMax.
Produced from Hagen Fluval, these filter materials are one of the most advanced in tech around the globe. The inside of the filter are organized to create a multi-stage filtration system from foam pad to carbon cartridge and finally to Biomax.
For the first stage, the foam pad mechanically traps large particles. The second stage witnesses the carbon cartridge trapping fine debris and getting rid of impurities to improve water smell and clarity.
Lastly, Biomax provides the best environment for helpful bacteria to process nitrogenous toxins to protect your aquarium inhabitants.
A unique feature of the Fluval U4 is that it returns water to the aquarium in 3 ways, including output, bottom output, and an integrated spray bar for better water filtration and circulation.
There you will find an adjustment knob on the top of the output for you to adjust the water output to achieve gentle flow and quiet operation.
Aqueon Quietflow internal power filter AT30
If you’re looking for an in-tan filter that’s customizable, search no more. Aqueon quiet flow internal filter allows you to position vertically or horizontally.
You can adjust the return flow rate, as well as the direction and height of water return. What makes it loved by lots of hobbyists is the very large filter chamber for using filter media.
Additionally, You can use your favorite filter materials or ones coming with the product package.
As expected, this best internal aquarium filter uses a large internal filter cartridge from Aqueon quiet flow internal filter to provide you with a 3 stage filtration, including chemical, biological, and mechanical.
Dense foam for trapping larger particles, activated carbon to eliminate odors, chemical toxins, discolorations, and patented BioGrid to take care of ammonia and nitrites.
This is an ideal choice for aquariums or reptile tanks up to 30 gallons.
Penn Plax Cascade 600 submersible aquarium filter
The #6 spot of our listings of the best internal aquarium filter review in the UK is Penn Plax. It offers advanced chemical, biological, and physical filtration while increasing the aeration of your fish tank; Penn Plax Cascade 600 is a submersible filter for you.
With the ability to deliver up to 175 gallons per hour of flow rate, the filter is an ideal choice for 20-50 gallon fish tanks or terrariums.
The Penn Plax Cascade 600 internal filter can and will clean your aquariums at different levels. In addition, it comes equipped with an activated carbon cartridge to get rid of harmful chemicals and toxins, odors, discoloration, and other contaminants in the water.
It also comes with an internal sponge that helps to increase the colonization of beneficial aerobic bacteria, which gives a healthy balance in the aquarium environment. Finally, because of its large capacity, you can select your favorite filter media to use.
The filter comes with a pump head that allows you to adjust the water direction and flow. In addition, you will find a spray bar in the package that helps to divide the output water into many small streams, which enhances your aquarium aeration and biological filtration.
You can place the filter horizontally or vertically and make it hidden from view.
Ca 900 internal aquarium filter for tanks up to 50 gallons
Yet another quiet aquarium filter is a good choice for the filtration system of turtle or fish tanks up to 50 gallons. It has a 235 GPH output and is ideal for both freshwater and saltwater environments.
With dimensions of 3 1/2″ x 2 1/2″ x 12 1/2″, it can fit most tanks with ease. It also has an airline hose for oxygen input, which increases the aeration of your tank and makes your fish and turtles active and healthy.
SunSun 528-GPH internal filter for turtle tanks
Last on the list of the best type of aquarium filters is the SunSun filter. It comes with a two intake system, one comes from the bottom of the filter, and the other one from the top plays the role as a surface skimmer, which keeps the water surface free of dirt particles.
The system is made up of a 1-pump, 2-impeller return system that provides optimal water flow. You can also configure the filter to include a spray bar.
It features a sponge pre-filter media and a carbon basket filled with premium carbon, which keeps your aquarium water clean and clear.
This internal filter comes with a powerful filtration of up to 528 gallons per hour, and I advise you use it for your turtle tank.
Choosing An Internal Aquarium Filter
Before you pick your favorite internal filter for your fish tank, ensure you know what types of fish you will be keeping in your tank and the tank volume.
When selecting the best internal aquarium filter for a tropical fish tank, we strongly advise you to consider the following pros and cons with internal filters.
Internal Filter – Pros
- Low maintenance
- Easy to install
Internal Filter – Cons
- Performs best on tanks smaller than 20 gallons.
- Smaller Filter Volume
Internal fish tank or in-tank filters are created to be placed within your aquarium, primarily in one of the rear corners. And remain totally submerged in the water.
A lot of them will have an outlet that will be located just beneath the surface of your water.
The filter then sucks water in near the bottom and pumps the water through the filter media located inside the filter unit.
Although visible, internal filters allow you to place the tank up against a wall.
Other benefits of the Internal Aquarium Filters include
- Quite, perhaps quietest
- Easy to maintain
Look for a good hiding place to hide the tubing and filter. Place the filer in a corner (best placement).
Ensure you have the correct filter media cartridges for your filter and insert the media into your internal In most cases your filter will come with a few media cartridges ready for set up.
Keep in mind: Whenever you feel uncertain about the filter media you acquire, look for the model number for your filter either on the back of the filter or on the box and purchase media used with your model.
If you have a Cascade 700 Internal Filter you will want to buy filter media for the Cascade 700.
If you’re confused or uncertain, here’s a simple trick:
Head over to Amazon and enter your filter model in the search bar.
Click on your filter in the search results and you will be directed to a page that looks like the image below.
Cascade 700 Internal Fish Tank Filter For Sale On Amazon.
Now, you should be face to face with the Cascade 700 Internal Filter.
If you look to the bottom “Left” of the image there is a section called “frequently bought together”.
Amazon is showing you the exact filter media needed for this exact filter.
Pretty Awesome. Right?
A bigger number of internal filters will come with suction cups to press against the glass. Place your filter into the fish tank and make sure it is attached to the glass.
See to it that the complete filter is covered with water and plug it in. The filter will start to suck water into the canister.
The modern era we are in today has witnessed the trend of aquariums because of the many benefits it brings to people and their homes. For example, it can serve as a decoration and brings good luck to the family.
It also educated the kids and young adults on the responsibility, roles, and importance of animals and man to the ecosystem.
Internal aquariums filters are also crucial to aquariums. You can invest in one now by selecting one of the best internal aquarium filter reviews we have shared today and watch your tanks stay cleaner and longer for many years.