How to Get Rid of Bacterial Bloom in Aquarium

If you have an aquarium, then you’ve probably noticed a bacterial bloom now and then. While it’s not harmful to your fish, it can be unsightly.

In this post, we’ll tell you how to get rid of bacterial bloom in aquarium for good. Keep reading to learn more.

What is bacterial bloom?

Bacterial bloom is a condition in which there is a large number of bacteria within the aquarium.

There are two types of bacterial blooms: freshwater and saltwater. Freshwater is when a bacteria in the aquarium gets out of control and begins to multiply, creating a brownish film over everything in the tank.

Saltwater is when algae begin to grow out of control and covers objects with green slime.

What is bacterial bloom in a freshwater aquarium?

It has many causes, and in some cases, it is caused by overfeeding. This is because when you feed your fish, uneaten food and waste fall to the bottom of the tank.

Bacteria thrive on this food, and that’s why it’s important to clean your aquarium every day by removing uneaten food and waste.

What are the signs of bacterial bloom in an aquarium?

When there is a large number of bacteria present in your aquarium, you will see evidence of it in the form of yellow, green, or brown stains on your tank walls.

You may even experience the cloudiness of the water and an unpleasant smell.

If your aquarium suffers from either of these types, you will notice that things like decorations or plants start to look discolored (brown or green) and slimy.

It can also leave a film across the glass that blocks your view of the tank’s contents.

These can stunt the growth of your fish and turn their gills brown.

In freshwater, the excess nitrates encourage algae to grow quickly, leading to a green aquarium full of slime-covered plants and decorations.

What causes bacterial blooms in aquariums?

Bacterial blooms in aquariums happen when bacteria grow too quickly. This can be caused by a few factors, including:

– Bacterial blooms in saltwater aquariums are caused by an overload of nutrients, particularly nitrates.

-These fish-killing toxins build up from uneaten fish food or decaying fish/plant matter, and encourage bacteria to reproduce. Excess food sitting in the water will cause a bacterial bloom. In this case, you’ll need to do a large water change to get rid of the food.

-Biofilm (a slimy coating that forms on objects like rocks or decorations) can cause a bacterial bloom. This biofilm is made of excess food and waste. To remove the biofilm, scrub it off with a toothbrush or small plastic bristled brush. If there’s already too much bacteria in your tank, you should do a large water change before scrubbing down your aquarium decor.

-If you have an air stone or powerhead aerating the water, it could be disturbing the bacteria in your tank. Either turn off these items for a day or two to let the bacterial bloom die down, or risk killing too much of the beneficial bacteria needed for healthy fish.

-High nitrate levels can cause more bacteria to grow. To lower your nitrates, do regular water changes and use a product like Seachem Purigen, which absorbs nitrogen from the water.

-High ammonia levels can also cause a bacterial bloom. Make sure you don’t have too many fish in your aquarium and that they’re not being overfed. Also, make sure you do regular partial water changes to keep ammonia at bay.

-Medications such as antibiotics will kill off both good and bad bacteria, so you should always use them in a well-cycled aquarium.

If none of these factors apply to your tank and your fish aren’t sick, then the bacterial bloom is probably just a temporary problem that can be fixed easily

How to get rid of bacterial bloom in an aquarium?

How do you treat an aquarium with a bacterial bloom is a common question. Treating an aquarium with a bacterial bloom is fairly easy.

There are several steps that you can take to get rid of bacterial blooms in your aquarium.

-First, you should perform a large water change, preferably about 50%. Doing this will remove the excess food particles that have accumulated in your aquarium, which is what the bacteria feed on.

-The first step is removing all the fish from the tank and putting them in a separate container. This will prevent your fish from dying!

-Clean everything in the aquarium with a gravel vacuum or water changes.

-Then, dose the tank with activated carbon to remove any remaining toxins.

-You can also use iodine to treat green saltwater tanks, but it is important you follow the directions closely for this product!

Now that you have cleaned up your fish tank, move on to treating your fish. Chances are, they don’t like having slime all over their nice clean home.

-Using an antibiotic treatment is the safest way to kill off any remaining bacteria. Some fish medications contain malachite green (which can be harmful to invertebrates), so make sure you choose one that doesn’t before administering it.

-If you notice nitrate buildup, perform a series of large water changes until the nitrate levels in the aquarium drop.

-Then, reduce feeding to just once or twice a day and make sure you only give your fish the exact amount they will eat in five minutes or less. Feeding your fish only the proper amount, and keeping the calcium levels high will also go a long way in keeping them from getting sick.

-The best way to stop bacterial blooms from happening in your tank is to clean it regularly.

-If you suspect that a bacterial bloom may be starting (slimy decorations or brown spots on newly added plants), stop all feeding immediately and perform a water change. Then, use an antibiotic treatment to kill any bacteria that may be present.

-You should also clean your filters regularly. Changing the plants in your aquarium can help as well because they act as a natural filter.

-Lastly, it may be necessary to remove the excess fish that is causing the problem. If you have more fish in your aquarium than can be supported, they will produce an excess of waste which contributes to the problem.


How long does bacterial bloom last?

Is bacterial bloom bad for fish?

While it’s not dangerous to your fish, it’s still disturbing and unsightly. Luckily, you can fix this problem using the steps below.

Will bacterial bloom go away on?

No. Bacterial blooms in your aquarium occur when there are too many single-celled organisms growing too quickly. The most common type of bacteria that causes a bloom is called “pink bacterium,” but there are plenty of others.

When a bacterial bloom occurs, it can make your aquarium water look cloudy or discolored. It can also make the water slimy, sticky, or slippery.