How Often To Change Fish Tank Filter

How Often To Change Fish Tank Filter

Fish tanks are great fun to look at, but they also require regular maintenance.

The water quality in your aquarium depends on several factors, including the type of fish you have, the size of your tank, and the amount of light it receives.

If you don’t regularly replace the filter media, then your fish won’t get enough oxygen and their health will suffer.

You should change your filter every two weeks, depending on the size of your tank. This way, you can ensure that your fish receive the optimal level of oxygen.

In this article, we’ll explain why you should change your fish tank filter fortnightly.

We’ll also look at the different types of filter that you can place in an aquarium.

How Often Should I Change an Aquarium Filter?

The first thing you need to know when changing a filter is how often you should do so.

Here’s what you need to consider:

  • Size of your tank
  • How much space there is around the filter
  • Amount of light your fish tank gets
  • Amount of food your fish eat
  • Type of filter you use

You should change your filter after 2-3 months if you have a small tank or one with low lighting levels.

For larger tanks, you will need to change your filter at around the 6-month period.

Why Should You Change Your Aquarium Filter?

Aquarium filters remove waste from your fish tank.

They also provide bacteria for your fish to live off.

A bad filter could cause problems such as cloudy water, which could make your fish sick. It could also lead to algae growth.

If you have a smaller tank, you may only notice that something isn’t right when it becomes very dirty. 

Most people think that changing the filter once every month is sufficient.

But, this is not always true.

Changing your filter more frequently than this can help prevent your fish from getting ill.

Types of Filters Available

There are many different types of aquarium filters available.

Each has its own pros and cons.

Some filters are designed specifically for saltwater tanks, while others work well in freshwater tanks too.

There are three main types of aquarium filters:

Pump Filters

These are placed directly below the surface of your aquarium.

They usually consist of a pump that pushes the water through a series of tubes.

These tubes collect debris and other impurities before passing them into another tube where they are filtered out.

Gravel Filters

Gravel filters are similar to pumps, except that they contain gravel instead of plastic tubing.

This helps to keep the water clean by trapping any particles that pass through the system.

Sediment Filters

Sediment filters are used in freshwater tanks.

They’re designed to trap sediment and other impurities that are present in the water.

Which Type Of Filter Is Best For My Fish Tank?

All of these types of filters work well for most fish tanks.

However, some are better suited to certain species of fish.

For example, saltwater fish prefer to swim near the bottom of the tank.

Therefore, you would want to choose a filter that sits just below the surface of the tank.

For freshwater fish, you should choose a filter that sits above the water line.

This prevents the fish from being able to access the filter.

How To Clean A Fish Tank Filter

How To Clean A Fish Tank Filter (1)

To clean a fish tank filter, you need a couple of pieces of equipment.

These include:

  • Fish net
  • Towel

First, place your fishnet over the top of your filter.

Then, gently lift up on the sides until you see the filter come away from the base.

Remove the filter from the base and lay it flat.

Next, take your towel and wipe down the entire filter.

Be sure to get all the dirt and debris off.

If there’s anything stuck to the inside of the filter, try using a toothbrush or tweezers to dislodge it.

After cleaning your filter, put it back together and replace it in your aquarium.

What Happens When I Don’t Change The Filter?

Not cleaning your filter regularly can lead to serious health issues.

If you don’t clean your filter properly, then it won’t be doing its job correctly.

As a result, you could end up with cloudy water.

Algae can grow in the poor quality water.

And, you might even find dead fish floating around.

When you don’t change your filter regularly, you run the risk of having an unhealthy environment for your fish.

How Do I Know Whether Or Not My Filter Needs Replacing?

You should check your filter on a regular basis.

Look for signs of damage and wear and tear.

If you see anything wrong, then replace the filter immediately.

You can tell if your filter needs replacing by looking at how much water passes through each time you turn it on.

If there’s no noticeable difference between the amount of water going through the filter versus the last time you checked it, then you probably need to get a new one.

How Long Should I Wait Before Replacing My Old Filter?

If you’ve been using the same filter for several months or years, then you should consider replacing it sooner rather than later.

If you have a large-capacity filter, then you may not notice any changes in the amount of water passing through it.

In this case, you can wait longer before changing out your filter.

However, if you have a small-capacity filter, then it’s best to replace it as soon as possible.

You never know when something will happen to cause the filter to stop working.


A good way to keep your fish healthy is to make sure they have a clean and safe habitat.

One of the easiest ways to do this is to use a good filtration system.

Your fish tank filter is one of the most important parts of your setup.

It helps to remove waste products from the water so that your fish aren’t exposed to harmful chemicals.

It also keeps the water clean and clear.

Without a proper filter, you’ll likely end up with algae growing in the tank.

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