Why Do Glofish Keep Dying?

Glofish are popular for their vibrant colors and playful demeanor. They can be kept in minimal tanks or even pets in a huge aquarium setup. They are small, easy to care for, and colorful.

The popularity of the Glofish has increased overtime because of their minimal maintenance, luminus color option and appy nature. 

Glofish thrive in clean water and maintain the zeal of your fish tank. But often, they seem to be dying off. This increase has led to their high mortality rate.  

One possible reason for the high mortality rate is that they are susceptible to water temperature changes, specifically those that are sudden. Additionally, they are also vulnerable to parasitic infections and can die from overfeeding. 

In this write-up, we will talk about all possible causes of why Glofish keep dying, how to treat the various diseases in Glofish, and how to prevent diseases and early death in Glofish. Please keep reading.

10 Reasons Your Glofish keep Dying

If you have a Glofish, you know it is simple to care for and fun to watch. Unfortunately, Glofish can also be very sensitive to changes in their environment. 

If their water is not properly balanced or if they don’t get enough food or water, they can die. Here are 10 reasons why your Glofish might be dying:

Improper Aquarium Setup 

Improper aquarium setup is the number one reason why Glofish keep dying. Many people think that a small tank is perfect for having a Glofish. 

However, this isn’t always true. A well-sized aquarium for a single Glofish should be at least 5 gallons, and it should have plenty of room to swim around. 

A lot of people also think that Glofish doesn’t need filters, but this doesn’t seem right. Because Glofish are disease-prone, a dirty water environment can make them stressed out and sick. 

Incompatible Pair Up

When housed with incompatible partners, Glofish can quickly succumb to death. This happens because while compatible pairs can peacefully coexist, the two different species or the nature of fish cannot live together. 

They will constantly battle for dominance. Glofish sharks and Glofish Bettas are incompatible for dwelling in one tank. They are really different in nature. They will fight over food, and can end up harming each other. 

Additionally, if you have a pair of Glofish betta don’t put them with other Glofish species like barbs, tetras, and danios. These three are called fin-nippers and they will do harm to your Glo bettas.

Also don’t keep your fish with large and aggressive ones. It may try to hurt its smaller companion. And if one fish is more aggressive than the other, it will stress you Golfish.

Size of the Aquarium

Many people who keep Glofish mistakenly believe that a small aquarium is better for the fish. This information is not always true. A small aquarium can be more harmful to a Glofish than a large one. 

A single 5-inch Glofish betta requires a minimum of 5-gallon tank. That means one gallon per inch. And while you are trying to schooling your group Glofish barbs, tetras, and danios you have to arrange a 20 to 30 gallon tank. 

Glofish need room to swim and hide. A small aquarium will not provide enough space for them to do these things, leading to stress and eventually death. 

Overfeeding Your Glofish 

Whether it’s overfeeding or underfeeding both are harmful for Glofish. If you leave your Glofish with limited food it will suffer from malnourishment and end up with low immunity and disease.

On the other hand, overfeeding can also lead to breathing problems, parasites, and even death. That’s why it is important to be mindful of feeding your Glofish. Only provide enough food to maintain their weight and swimming activity.

Lack of Aquarium Maintenance

Lack of aquarium maintenance is the most common reason for Glofish to keep dying. Many people think that cleaning the tank once a week is enough, but this is not enough. 

Dirty water is the obvious cause of mass death of your Glofish. So a properly maintained tank with regular water changes is must for your Glofishs’ health. 

A proper filtration system and temperature control is also mandatory. Additionally, you have to add new gravel and plants every few weeks to keep your fish healthy.

Bacterial Growth in Your Aquarium 

Bacterial growth in your aquarium can be a leading cause of your Glofish’s early death. The bacteria is most likely caused by the fish waste and organic material that accumulates over time. 

Bacteria feed on these materials and cause a mass of growth, killing the fish. It also causes a foul odor, poor water quality, and disease. Sometimes it becomes so severe that you may need to change the whole aquarium set up. 

So Whenever you notice any signs of bacterial growth in your Glofish aquarium, take steps to address the problem ASAP. 

Rapid Changes in Water Parameter 

Glofish are freshwater fish and need a specific set of water parameters to live healthily. When the water parameters change too quickly for a Glofish, it can result in stress and death. Recent studies have shown that rapid changes in water parameters can be deadly to Glofish. 

These changes include high levels of chlorine or other chemicals, low levels of dissolved oxygen, or sudden temperature changes. Changing the aquarium frequently for Glofish is also harmful to Glofish. 

Disease or Parasite

Glofish are susceptible to several diseases or parasites that can kill them. Some of the more common diseases or parasites that Glofish can contract. The symptoms includes ripped and ragged fins, inflammation, and bloating

Glofish can also be affected by other diseases, such as fin rot disease and columnaris. Aquarium owners should be aware of the dangers posed by these parasites and diseases and take steps to prevent them from affecting their Glofish mortality.


Stress is a common problem for pet Glofish. Glofish are prey animals that are particularly sensitive to stress and can die from it. 

Many of the same factors can stress your Glofish, such as loud noises, sudden changes in water temperature, competition from other fish, and a poor aquarium environment. 

All of these causes can stress out your Glofish. If you’re having trouble keeping your Glofish healthy and happy, try to address the sources of their stress. 

Bring positive changes in the environment, handle the water properly, and prevent keeping your Glofish with other fishes that are aggressive or threatening.

Glofish is Aged

One potential reason that can cause your Glofish’s death is it becomes aged. An average Glofish’s lifespan is 4 years. Glofish sharks can live upto 8 years.

But unfortunately, most Glofish die within a year. When Glofish reach adulthood, they naturally start to die off. But sometimes, Glofish can age quickly and die. 

There are a few ways to tell if your Glofish is aging, including changes in their color, shape, size, and behavior. If you notice any of these changes, it’s time to check up on your fish. Help it with special attention. 

Treatment for Diseases in Glofish

Diseases in Glofish can be treated with a variety of treatments, depending on the type of disease and the severity. 

For example, diseases such as white spots and Ich can be treated with antibiotics, while diseases such as dropsy may require surgery to remove the affected organs. 

Glofish owners should consult with their local fish store or veterinarian to determine the best treatment for their particular Glofish.

Prevention of Disease and Early Death in Glofish

Prevention is always the best medicine. And this is especially true when it comes to keeping Glofish healthy. 

There are several ways to prevent disease and early death in Glofish. Follow these simple tips to keep your fish healthy and disease-free: 

  • Keep a Clean Tank: Regularly clean your tank with a gravel vacuum cleaner and water change. This will help to prevent disease and improve water quality. 
  • Feed Your Fish Right: Glofish need fresh, clean food and a moderate diet. Maintain a two-time a day feeding schedule. Strictly restrict overfeeding of your fish. 
  • Get a Good Mate For You Glofish: Glofish are calm. They are non-aggressive and playful. So mate them with fish with the same personality. That can be Hillstream Loach, Pleco, Ricefish, and Minnows. 
  • Control the Water Parameters: Check your fish tanks’ water quality regularly. And make sure the temperature, acid-alkaline balance, and oxygen level are optimum. 
  • Bacteria and Parasite Control: Whenever you notice your Glofish is affected by parasite or bacteria, be alert and replace your fish and treat it separately.Use a good antibacterial solution and parasite control solution to your tank. And make sure the risk is completely gone. And do the check-up every month. 

Besides these, choosing the right tank with a good setup is also necessary from the first time you get a Glofish. Treat your Glofish well, and keep it happy for a long life for your Glofish.


Glofish are the most vibrant species of fish. They are small, low-maintenance fish that can be kept in any aquarium. With few of them you can turn your aquarium into a carnival. 

Besides being minimal to keep, Glofish are sensitive and commonly prone to diseases and premature death. So you have to keep the Glofish in a clean and healthy aquarium environment. 

Providing your Glofish with fresh food and water and avoiding exposure to other diseases will greatly help in reducing your Glofish death rate.

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