Best filters for goldfish that you should equip for your tank

Goldfish are one of the easiest to raise. They are beautiful, and they like swimming and entertaining us. They are ideal pets for families with children or others traveling often since they don’t need daily feeding. In particular, goldfish are notorious for creating a lot of waste, which is why you should put a strong filter in their tanks. The change of water is difficult to do every day; so, a good filter helps to handle waste accumulation. Let’s take a look at the top 5 best filters for goldfish as follows.



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Top 5 best filters for goldfish you should know

Top 1: Hikari Bacto-Surge High-Density Foam Filter

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Outstanding features:

Natural habitats for goldfish include near-stagnant wetlands, streams, and other still bodies of water. So, you’ll need a low-flowing filter in your aquarium. In light of this, we recommend the Hikari Bacto-Surge High-Density Foam Filter as the perfect goldfish aquarium filter. The filter satisfies all of our criteria and is simple to use, mount, and maintain, while also offering excellent biological and mechanical filtration for a good goldfish tank.

  • The flow rate is extremely low – almost zero.
  • Tanks range in size from 5 to 15 gallons.
  • Media includes foam, biological filtration

Overall, the Hikari Bacto-Surge is the very best goldfish filter available. It is inexpensive, it works well, it runs silently, and it has a really low flow rate for your stagnant pond critters. It is, though, a bit too large for the smallest tanks, which can be a pain.


The Hikari Bacto-Surge High-Density Foam Filter, also known as a sponge filter, is suitable for a number of aquariums, including betta tanks and goldfish tanks. It doesn’t produce any sort of current that can interrupt your little goldfish’s normal feeling climate. It doesn’t pump water; instead, it filters it. It makes a cool, quiet stream of bubbles as it works.

This is also a really quiet filter, which we appreciate for goldfish ponds because these peaceful little guys are usually raised in small spaces and places where quiet is needed – the workplace, the kids’ room, the family room. Since the filter is submersible, it has a weighted bottom to help it stay in place. Some filters don’t do that and tend to float around instead of remaining there. Furthermore, it cleans the tank – including planted aquariums and muddy water – to provide a safe, stable atmosphere for your little goldfish.

Cons: It might be too large for some aquariums.

Top 2: Penn Plax Premium Under Gravel Filter System

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Outstanding features:

The Penn Plax under gravel filter is the best solution for those looking for a low-maintenance filtration device. This machine includes four filter plates for simple installation in 40- to 50-gallon fish tanks, as well as clips to keep the filter in place without having to fiddle with it for a long time. It also has extra-large, flexible 1-inch lift tubes for smoother installation, repair, and so on.

  • Flow rate: close to zero
  • The size of tank: 40 to 50 gallons
  • Media: Biological and chemical filter, under gravel plate

The Penn Plax under gravel filter is an excellent option for someone on a budget. It is quick to install, change the flow control, clean and maintain. After installment, you don’t need to do anything with it. However, you should make sure to choose the correct size for your aquarium to ensure it meets the requirements.


First and foremost, this filter is easy to use. You set it up correctly under the gravel, turn it on, and it takes care of the rest, saving changing its own cartridges. Furthermore, it provides biological filtration as well as a wide surface area for beneficial bacteria to evolve. Meanwhile, chemical filtration is provided by the use of carbon filter cartridges, which capture odors, discolorations, and other contaminants in porous parts of carbon.

Under gravel of filters won’t mess with your in-tank aesthetics. In addition, the Penn Plax under gravel filter is simple to set up and maintain as well as being reasonably priced.

Cons: This filter is that the tubing can be too small at times. It is important to ensure that the aquarium you buy is the correct size.

Top 3: Marina S10 Power Filter

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Outstanding features:

The Marina Slim S10 Power Filter is a perfect choice for those who want a decent HOB (hang on back) filter that is easy to maintain, clean, install, and is self-priming.

It’s manufactured by one of the most reputable companies on the market, it’s compact and slim, as the name means, and it’s suitable for small goldfish ponds and aquariums, offering full biological filtration.

  • Low to moderate flow rate, flexible
  • Tank capacity: up to 10 gallons
  • Media: Biological, ceramic


The Marina Slim S10 is ideal for small fish tanks up to 10 gallons in size. It’s a fantastic HOB filter that’s as simple to set up as any filter should be. Besides, it has an adjustable flow rate, making it ideal for goldfish tanks with low flow rates. However, since it is very powerful, you can need a baffle in a tank of that size.

Since the Marina Slim S10 is so simple to keep clean and maintain, your goldfish will be healthy in your aquarium. It also has a lot of space for beneficial bacteria because it’s made with ceramic rings that encourage growth.


The only downside to this filter is that it is a bit more costly than some of its rivals. For anyone on a limited budget, it will be feasible.

Besides, in fact, it only provides biological filtration rather than mechanical filtration. That’s why it doesn’t score as highly in our list of the best goldfish filters.

Top 4: Tetra Whisper Internal Filter for Aquariums

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Outstanding features:

This Tetra product is a perfect alternative for those who choose an in-tank filter to one that hangs off the back of their tank. This filter for 4-gallon aquariums uses small filter cartridges which quickly respond to high or low water conditions. A 4-gallon aquarium is cycled more than 6 times per hour by the internal 27 GPH engine. It has a two-in-one filter. Ultra-Activated carbon prevents odors and discoloration, while cartridge floss catches debris and fish waste. Your tank can be put right up against the wall with this pump, which is very useful if you have small space, in particular. With the internal filter built to clip on your tank wall and be covered by décor, your aquarium will be flush to the wall. The aquarium clip is included, and installation is easy.


  • It’s easy to adjust the water level from high to low.
  • A bracket may be used to position it.
  • It may trap debris and fish waste, as well as eliminate odors and discoloration.
  • It is designed to save space.


  • The mounting clip is vulnerable to break, and substitutes are difficult to come by.

Top 5: Marineland Penguin Bio-Wheel Power Filter 100 GPH

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Outstanding features:

This MarineLand Penguin Power Filter is available in a variety of sizes, beginning at 10 gallons and up to 20 gallons. You will have a filtering rate of up to 100 GPH depending on the size you get.

The multiple sizes are a helpful function because it guarantees that one style or another will be a suitable match for your tank. A three-step filtration mechanism is also integrated into the MarineLand Penguin Power filter for your fish tank.

The only disadvantage of this filter is that it is less silent than most filters. It takes some time for the filter to adapt and get good water flow flowing when you first mount it, which makes it a little noisy at first. Similarly, as the filter is at the end of its existence, it makes noisy noises as a result of its prolonged use.


  • The flow rate is outstanding.
  • There are various sizes available.


  • Less silent

How should you purchase an aquarium filter for your goldfish tank?

Now that you have a basic understanding of the various kinds of tank filters, you should concentrate on finding one that satisfies your unique specifications. Choosing a goldfish filter necessitates close thought. When hunting for the best filter, there are a variety of things to hold in mind.

Tank and Filter Size

Filters are available in a variety of sizes and are normally rated for tanks of varying sizes. Aquarists refer to the flow rate as they speak about filter size.

Your aquarium would have impurities unless the filter has an optimum flow rate.

The volume of water filtered in an hour is referred to as the flow rate. You should strive for a flow rate of five times the volume of your aquarium per hour as a minimum.

A more efficient model should be able to produce ten times the amount of water in your tank every hour. The filter can produce a flow rate of 100 to 200 gallons per hour if you have a 20-gallon tank.

It’s also a good idea to have a filter that’s built for a bigger aquarium than yours. A filter designed for 30 or 40 gallons would work well in a 20-gallon tank. Over-filtering the aquarium will keep it safe and stable.

Types of filters

External or internal filters are the two most common types of filters. External filters are placed outside, while internal filters are located inside the water.

Since they can handle more filter media, external filters are thought to be more efficient. You can even keep them in aquarium cabinets to keep your tank from being overcrowded.

Filters come in a variety of shapes and sizes, including canisters, hang-on-backs, and sponges. The most effective filters are canister filters, but they are also the costliest. Sponge filters are better for small installations, whereas hang-on-back filters are more cost-effective.

Filter Features

The filtration system is the most critical component of a filter. A good model should be able to hold a large number of media and allow you to adjust the media to meet your filtration needs.

Biological filtration is particularly important because it promotes the growth of bacteria that clean out contaminants such as ammonia.

To keep the tank clean and free from waste, the filter can both allow mechanical and chemical filtration. To ensure that your goldfish are living in a suitable environment, the model must be productive and energetic.

Flow of water

Although goldfish enjoy a certain amount of current, they need areas where they can relax comfortably. You should hold the current to a minimum because their long fins get stuck in the flow, making the fish move to other areas. These abrupt movements can quickly trigger fear in your fish.

Best filters for goldfish FAQs

What does a goldfish filter function?

The crud in your goldfish aquarium is flushed out by goldfish tank filters.

They extract detritus that can destroy fish, such as fish waste and surplus food, which contain ammonia, chlorine, fluoride, heavy metals, nitrates, nitrites, and other dangerous chemicals. Good bacteria thrive in the fish tank as a result of the right filter, which fights off harmful bacteria, ammonia, fungal infections, and other things that are trying to ruin the goldfish. To put it another way, you need a filter. Without one, the fish will perish quickly.

When should you clean a goldfish filter?

Weekly water changes are part of the goldfish tank cleaning routine. However, the time that you should clean the filter depends on the filter types which you have.

Canister filters, for example, can be cleaned every three months, while hang-on-back (HOB) ones are less tolerant. You should clean the HOB filter at least once a month or a few weeks.

You should not clean the filter very much because it also contains a large number of beneficial bacteria.

Is a strong flow of water suitable for goldfish?

It’s best to keep the goldfish away from strong water currents. The goldfish is especially susceptible to the strong flow of water and can become stressed if it is continually pushed about.

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