fish tank bubbles

Why Does My Fish Tank Have Bubbles?

Every fish tank is designed with a specific purpose in mind. However, some might find that the fish tank has different functions than it was originally intended to. If your tank looks like it has bubbles, what should you do? Well, maybe it’s time to contact your local aquarium shop or just check out these tips for why does my fish tank have bubbles? So let’s get started

8 Common Causes of Bubbles in Your Fish Tank

Here are the 8 most common causes of bubbles in your fish tank. See which one of these is the reason for bubbles in your fish tank:

1- Agitation In Water

fish tank water bubbles

The causes of bubbles in the fish tank are many and varied. However, agitation in water is the most common cause of bubbles in a fish tank. Agitation can be caused by a variety of things, including the movement of the fish tank itself, or by anything else that disturbs the water’s surface, such as a plant or other debris. In addition, agitation can also be caused by the movement of the filter sponge or filter media itself.

2- Filtration And Aeration Components

If you have a filtration system that allows too much air to enter your tank, then it will cause bubbles to form. Your fish may see these as food and eat them causing the bubble formation. If you have a low-oxygen system and your fish are not able to get enough oxygen through their gills, they may also be able to sense this and eat their way through the bubble coverings.

3- Algae

Algae are the most common cause of bubbles in fish tanks. Algae grow rapidly in oxygen-rich water and can increase the surface tension of the water, causing it to form bubbles when agitated. This effect can be seen with bubble walls on a glass surface that has been agitated by air or by water.

Algae will grow on the surface of your tank and look like little white or green patches floating on the water. After a while, these patches begin to multiply and cover more and more of your tank. Eventually, they will block out sunlight, causing your fish to starve or die. You may even see that algae have grown into something like a blanket across the surface of your tank.

4- Heater

fish tank bubbles

The heater is responsible for keeping the water temperature at a constant level. If the heater becomes clogged, it can cause bubbles in the tank. To avoid this problem, clean the heater regularly and remove any debris from it.

5- Decaying Organic Matter

Bubbles in the fish tank are usually caused by decaying organic matter. This is because the gases released by decaying organic matter cause bubbles to form. The gases released by rotting plants, such as algae and moss can also cause bubbles to form in your fish tank.

6- Nitrogen Cycle

Fish like to hide in the substrate and feed on the bacteria that live there. The bacteria break down the food and produce nitrogen, which the fish then excrete. The nitrogen may come from decaying plants and algae, or it may come from the water itself. If you have a lot of nitrate in your tank, it can lead to an excessive amount of ammonia being produced by the fish, which can then cause a gas bubble problem.

7- Overstocking

Overstocking is also one of the most common causes of fish tank bubbles. Most people think that by adding more fish, they will be able to enjoy the same level of care as if they were only having one. However, this is not always the case and it can end up costing you more than you bargained for. If you have a small home aquarium with just a few fish in it, it’s best to get only one or two new ones every year or so. 

8- High Protein Diet

A high protein diet causes the fish to excrete ammonia, which causes a build-up in the tank that may lead to bubbles. This can be prevented by feeding the fish a diet that is low in protein and high in carbohydrates, such as flake food or pellets.

How to Get Rid of Bubbles in Your Aquarium?

If you just want to get rid of the bubbles, try adding some Epsom salts or baking soda. These will absorb the oil in the water and help to remove it.

You can also use an air pump with a long hose that you can place over the tank to suck out as much water as possible. This will help remove any excess oil that has settled on the bottom of your tank.

Clean out all of your filters and replace them if they are dirty or clogged with debris. Clean out any algae growing on top of your gravel or substrate, which will also help reduce bubbles in your aquarium.

Why Is There Foam in My Fish Tank?

Although there can be many reasons why your fish tank has foam, I have mentioned a few of the most common reasons for foam in your fish tank:

1- Improper Filtration

fish tank filter bubbles

Improper filtration is another major cause of foam in fish tanks. If there is any kind of blockage in the filter system, such as clogs or sediment buildup, it will cause the water to foam up when it goes through the filter instead of being filtered effectively by it. The result is essentially stagnant water with excess nutrients and other waste products still present within it.

2- pH Imbalance

A small amount of Phosphorus can also cause foaming problems in aquariums if not addressed properly by adding more phosphorous into the aquarium water via supplements or food additives such as flakes or pellets that contain phosphorous compounds within them (such as Seachem Phos).

3- Epsom Salt or Alkalinity Problems

If your aquarium has a problem with alkalinity or Epsom salt, it may be causing your fish to foam at the mouth. These minerals are necessary for good water quality, but they can be toxic if they build up in your tank over time. The best way to test for this is with a pH meter, which will tell you how much of these minerals are present in your water and whether it needs adjusting.

1- Toxic Water

Toxic water is a common cause of foam in fish tanks. Toxic water can be caused by many things, and the most common are nitrifying products in the water such as ammonia, nitrite, or nitrate. These chemicals can build up in the tank over time to toxic levels if they aren’t removed quickly enough.

Another problem with toxic water is that it can cause stress on your fish. If you have a lot of foam in your tank, it’s important to do some testing to see what’s causing it before you do any drastic changes to your tank.

2- Overfeeding

fish tank artificial light

Overfeeding can also be the reason why you have foam in your fish tank. Overfeeding causes a buildup of waste and toxins, which can eventually cause water quality issues in the tank. To avoid this problem, make sure to feed your fish only as much as they need to maintain their health and appearance. If your fish seem underfed, it’s time for a diet change!

3- Excessive Protein

Protein is essential for healthy fish, but too much of it can be harmful to your fish. A high protein diet can lead to excessive ammonia in the water, which is toxic for the fish. You may also see a cloudy appearance in your water that can be caused by the excess protein.

The best way to combat this problem is by feeding smaller amounts of food and feeding more often than normal. You should also make sure you always have fresh clean water available so that your fish can get rid of any excess waste material quickly and easily without having to swim back through the filtration system.

Why There Are Bubbles on Aquarium Plants?

Here are 3 of the most common reasons for this problem:

1- Over Fertilization

Bubbles on plants are usually caused by over-fertilization of the aquarium, which can occur when the fish tank is not cycled before adding new plants and fish. In this case, the additives in the water will cause a chemical reaction that releases bubbles into the aquarium water.

2- Rapid Growth Of Plants

Another cause of bubbles on aquarium plants is the rapid growth rate of your plant’s roots, which can lead to root rot as cellular waste from the roots begins to decompose. In this case, you may notice that some of your plant leaves look dry and brownish and have white spots on them.

3- Aesthetic Issue

If there are no visible signs of disease or damage to your plants, then it’s likely just an aesthetic issue, so don’t worry about it! Sometimes this bubble effect is caused by too much carbon dioxide in the air around plants (especially if you live in an urban area with heavily polluted air), which can cause algae blooms on plant leaves and stems, which produce more oxygen for animals and plants to breathe through when they need it most like after a light cycle change or when they first get added to your aquarium.

Why Does My Fish Tank Have Bubbles On The Glass?

1- Generally the way your tank is set up, you may have a lot of air bubbles rising to the surface. If so, you can fix this by adding air stones to the bottom of your tank and creating a siphon effect.

2- If there are no air bubbles on the glass, then it could be because you are using an uncycled filter system. You should run your filter for at least 30 minutes after every water change to help clear out any waste that might be in there from old fish or plants.

3- It could also be due to a leak somewhere in your plumbing system, which would require immediate attention as well as replacing all of the pipes in order for them to be watertight again.

4- There could also be something wrong with your pump, which would require replacing or at least testing it before anything else can be done about it.

5- Finally, if you have had a fish die in your tank, then that gas will remain trapped under the rocks and sand until they decompose over time into carbon dioxide gas (CO2) and oxygen (O2). This can cause some foam on top of the rocks, but if it’s not too bad then it’s not necessarily something to worry about.


Whether you want to keep a freshwater or saltwater tank or both, it is a lot of fun. The only thing that can ruin the fun of having a fish tank is having bubbles in your tank. Because if your tank has bubbles then it means that it’s not properly set up. Hopefully, this guide will give you the information that you need to get rid of the bubbles for good!