• Skip to main content
  • Skip to primary sidebar
  • Skip to footer
  • Cats
    • Cat Behavior Problems
    • Cat Health
    • Cat Nutrition
    • Cat Training
  • Dogs
    • Heat Cycle Info
    • Dog Behavior
    • Dog Health
  • Fish
  • Did You Know?
PET-happy logo

pet-happy.com

Tips to Improve Your Pet's Behavior, Health, and Life...

You are here: Home / Fish / How to choose the best filter for your aquarium

How to choose the best filter for your aquarium

February 13, 2019; By Maris Munkevics, Signe Munkevica

The cleanliness of aquarium water relies on a functioning water-filtration system. But there are so many of them, that it is easy to get confused. Before you set up your aquarium, you should learn the basic concepts of maintaining clean water in your fish tank with the help of aquarium filters. We will explain the stages of filtration, and familiarize you with the most common aquarium filter types.

Aquarium filter pipe and a fish
Photo: Maria Itina

Most people understand filtration to be the removal of waste. However, filtering is more than just that and consists of three steps.

  • mechanical filtration removes solid and dissolved particles from the water.
  • biological filtration converts fish waste products into plant nutrients with the help of microorganisms.
  • chemical filtration removes other wastes and contaminants that could not be removed in the previous steps, most commonly with the help of activated carbon,

Most aquarium filter types provide all three of those steps. But which type is the best choice for your particular needs?

Most common aquarium filter types

Below is a list of the most common aquarium filtration systems. If you are just starting with an aquarium hobby, you better go with one of these.

  • Internal submersible filters are suitable for aquariums up to 50 gallons (200 liters) and are the easiest to use. If you have a small fish tank, we recommend you to go for this option. The filter is an easy-to-install, standalone device, which is attached to the inside wall of an aquarium and pushes water through its sponge-like filter media. First, it is purely a mechanical filtration. However, once bacteria start to grow on the media, it also provides biological filtration. Most filters have two to three media pads that can be taken out, rinsed, or replaced when needed, and some filters have an option to put in a media that contains activated carbon, also providing a chemical filtration.
  • External canister filters sit below the fish tank. They take in and then return water to the aquarium through attached hoses. Obviously, such filters require a harder setup, and they usually cost more that internal filters. The added benefits, however, are that they can be cleaned without putting your hands in the fish tank and that their filter media can be customized. They usually contain several slots for filter media, which unlike internal filters, can provide several mechanical filtration stages (coarse, medium and fine)—one after the other. This fact makes it more efficient and prevents clogging. You can also add a filter media special for your needs. For example, some fish species require slightly acidic (pH < 7) water. In such case, you can insert a media containing peat, which acidifies the water on the go. The same holds true for other parameters that cannot be bought out of the box. If you test and find that your water is rich in phosphorus (a common cause of extensive algae growth), add media to reduce that.
  • Clip-on power filters are similar to external ones, only they are clipped on the side of the tank and sit slightly above it. There are no hoses to attach, but not all fish tanks have a space for them if you already have a hood on top of the tank. It is a common choice for out-of-the-box starter kits for beginners since the hood and everything else is already made for the specific filter. Note, though, if it breaks at some point, you will need to replace it with an exact same filter model or replace the fish tank’s hood.
  • Gravel filters use the gravel as a filtration media. These filters must be installed during the setup of an aquarium because a large plate is installed beneath the gravel. A large surface area means improved biological filtration. Biological material trapped in the gravel also means more nutrients for the plants, and there is also an added benefit that the filter is not visible; there are tubes that run along a back wall and corner, but they can produce bubbles, making them actually cool. It may be a struggle to set up a gravel filter, but, when done right, it works like a charm.

There are other filtration systems available, though not as common. Most beginners are likely to deal with internal or clip-on filters. If you come across a system not mentioned here, do not hesitate to ask the salesperson to explain how it works and seek information on the manufacturer’s website.

Note that whatever filtration system you choose, it relies heavily on beneficial bacteria that provide a biological breakdown of waste-products. This means, that, whenever you set up an aquarium, you should run it for several days before adding fish so that the bacteria have time to multiply and colonize the filter media. More on this in our next article on how to set up a fish tank.

We wrote more topics like this one. Please click below.

  • Best 20 Gallon Aquarium
    Best 20 Gallon Aquarium
  • Step by step guide to set up a fish tank
    Step by step guide to set up a fish tank
  • Does you fish tank need an air pump for aeration?
    Does you fish tank need an air pump for aeration?
  • Stuff that you will need to maintain an aquarium
    Stuff that you will need to maintain an aquarium

August 18, 2020

About us

This site is lovingly written by:
Signe Munkevica, Doctor of Veterinary Medicine.
Maris Munkevics, Animal Biologist and Animal Behaviorist.

Primary Sidebar

Recent articles:

My cat is running around like crazy! What to do?

How To Get Cats To Stop Eating Plants: 4 Ways

Can cats eat raw fish?

  • Top 10 Causes For An Excessive Chewing Dog
  • How to Get a Cat into a Carrier Voluntarily
  • How to stop your cat from biting when playing
  • How to stop a cat from scratching bedroom door at night
  • Why is my cat peeing on my stuff?

Dog Behavior

Female french bulldog looking at you with her head tilted

Can a female dog get pregnant while bleeding?

  • Can a female dog get pregnant while bleeding?
  • What to do when your dog is in heat?
  • Do Male Dogs Go In Heat?

Fish

20 Gallon Fish Tank

Best 20 Gallon Aquarium

  • Step by step guide to set up a fish tank
  • How much light does an aquarium need
  • Reasons for white cloudy water in aquariums and possible solutions

Newest Articles

My cat is running around like crazy! What to do?

May 26, 2022 By Maris Munkevics, Signe Munkevica

Is your cat frequently running in circles, trying to catch imaginary objects, zooming (aka cat zoomies) back and forth around the room or even climbing the curtains? Even though cats are well known sprinters, such sudden bursts of activity, at their … Continue here » about My cat is running around like crazy! What to do?

How To Get Cats To Stop Eating Plants: 4 Ways

May 19, 2022 By Maris Munkevics, Signe Munkevica

This spring, we decided to grow lettuce and dill in our windowsill. What a good intention. We could have fresh salad and herbs to make healthy meals. We planted the seeds with our kids help and we all were excited about the prospects. We were even … Continue here » about How To Get Cats To Stop Eating Plants: 4 Ways

Can cats eat raw fish?

May 13, 2022 By Maris Munkevics, Signe Munkevica

There are many myths surrounding the field about your cats diet. The most common ones are things like: Your cat can receive balanced nutrition only from commercial cat food.Meat-by products are evil. We wrote a whole article about this one.Cats … Continue here » about Can cats eat raw fish?

Top 10 Causes For An Excessive Chewing Dog

May 6, 2022 By Maris Munkevics, Signe Munkevica

Is your dog chewing you out of house and home? Of course we know that dogs chew a lot when they are puppies. While most dogs outgrow this habit, some may still continue with this activity and keep chewing on things after they grow up. Sometimes, a … Continue here » about Top 10 Causes For An Excessive Chewing Dog

How to Get a Cat into a Carrier Voluntarily

April 29, 2022 By Maris Munkevics, Signe Munkevica

Getting an unwilling cat into a cat carrier can be a hard task. Almost every cat owner will confirm this. But what about your cat going in to their carrier of their own free will? Many of you are probably shaking your head no and say that it is not … Continue here » about How to Get a Cat into a Carrier Voluntarily

Footer

About us

  • Pinterest
  • Facebook
  • Privacy policy
  • About Us
  • Contact us

Search

Affiliate Disclosure:

The following are affiliate links. As an Amazon Associate I earn from qualifying purchases.  This is used for keeping the blog up and running smoothly. Please know this does not change the price you see on Amazon. Thank you for your help and support of Pet-happy.com!

© 2022 PET-Happy.com
DMCA.com Protection Status