Why Is My Fancy Goldfish Sitting at the Bottom of the Tank: Causes and Solution

Fancy goldfish are the most popular fish in the aquarium hobby. They are beautiful fish and make a great addition to any tank. However, there is something that can go wrong with fancy goldfish: bottom-sitting.

There are many reasons why goldfish are bottom-sit, but the most common ones are malnutrition, stress, water quality issues, and fish diseases. If you notice that your fancy goldfish is sitting at the bottom of the tank often, diagnosing the problem and treating it as soon as possible is essential.

Most Common Reasons Why Fancy Goldfish Sit at Tank Bottom


Stress is one of the significant factors that can lead to disease in fish. Goldfish bottom-sit when they are stressed or anxious. This posture is often a sign of disease and must be addressed as soon as possible by a veterinarian. Some common diseases that cause stress include a change in environment, lack of socialization, new people/pets in the home, etc. 

It’s essential to identify which of these factors may be causing your fish problems and take appropriate measures accordingly. And lastly – provide plenty of food and quality water, so your goldfish feels happy and contented.


Goldfish can get bored of the same things repeatedly, which can lead them to the bottom of their tank. If you notice this happening, try adding some new fish friends or providing more food to keep them stimulated. This will help them explore their surroundings more and avoid getting stuck at the bottom of the tank. Goldfish may start looking for entertainment elsewhere when left alone, such as climbing on top of water droplets or exploring other parts of the aquarium.

Poor Water Quality

If you notice that your goldfish is sitting at the bottom of the tank more often, it might be time to take action. This usually happens when water quality is poor. Water quality can be affected by overfeeding, insufficient oxygenation, incorrect pH levels, etcetera. Poor water quality can also be caused by a lack of ventilation in the tank or an unfit filter system. To improve water quality for your goldfish, you can follow a few easy steps: change your filtration system regularly and add salt or fresh water to the tank as needed.


Goldfish are bottom-sitters because they want to stay close to the substrate where they find food and hiding places. If you do not provide enough food for your goldfish, it will eventually sit at the bottom of the tank. If the water level in the tank falls too low, the fish will sit on the bottom to keep their head above water. To prevent your goldfish from sitting at the bottom of its tank, make sure that it has plenty of fresh water and a good diet.

Inadequate Diet (Deficiency)

If your fish is not eating enough, it will eventually sit on the bottom of the tank to find food. Sometimes water changes or adding new fish can also cause a bottom-sit. For example, if you see your goldfish sitting at the bottom of the tank, take it to a vet for an assessment and proper diet advice! 

Goldfish are omnivorous, and their diets should include aquatic macro- and microorganisms (worms, insects, etc.). Feeders that give only pellets may lead to malnutrition because they do not contain all the nutrients goldfish need.

Environmental Distress

Poor water quality can also be caused by a lack of ventilation in the tank or an unfit filter system. If your goldfish is sitting at the bottom of its tank, it may be because it’s uncomfortable or stressed. Check to see if any cracks in the aquarium’s glass allow air and light into the fish tank. Also, ensure that all plants and decorations are placed, so they do not obstruct sunlight or airflow.

Swim Bladder Disorder

Swim bladder disorder is a condition that affects the goldfish’s swim bladder. This organ controls the fish’s buoyancy and allows it to stay underwater for an extended period. If the swim bladder becomes impaired, the fish will swim frantically around its tank or aquarium, often leading them to the bottom of their water tank – where they can become prey for other creatures. 

Swim bladder disorder can be caused by factors, including changes in water temperature or pH levels. A healthy goldfish should not show any swim bladder disorder unless there is a change on par with what would cause his swim bladder to malfunction in the first place! So if you notice your goldfish regularly struggling to stay submerged or showing unusual behavior such as swimming towards the bottom of his tank frequently, it is best to get him checked out by a vet!


Goldfish bottom-sit is the most common problem that fish owners face. And the leading cause of it seems to be parasites. While there are some simple ways you can prevent your fish from getting parasites, the best way to avoid them altogether is by following a good hygiene routine from the start. This includes ensuring water quality and temperature are ideal, washing hands regularly, and keeping your tank clean and parasite-free. If you do find that your fish has parasites, take them to a vet as soon as possible for treatment.

How to Solve the Concern of Fancy Goldfish Staying at Tank Bottom

It seems like the fancy goldfish in your tank is always sitting at the bottom of the tank. The fish keeps hanging around the bottom no matter how often you change the water. Is the water too shallow, or is the fish sick? There are a few reasons that goldfish bottom-sit, and you can solve the problem by following a few simple tips.

First of all, goldfish are susceptible to disease when kept in stagnant water. If the water in your tank is stagnant, it’s hard for the goldfish to swim and eat. Secondly, if there’s food or debris build-up on the bottom of the tank, the goldfish will gravitate to it to eat. Thirdly, if the tank water is too shallow, the fish won’t be able to swim and eat. And lastly, make sure your filter is working correctly and that there are no obstructions in the water flowing to the bottom of the tank if you solve the problems one by one.

Symptoms of Goldfish Diseases

Several different diseases can affect goldfish, and each one will cause the fish to display specific symptoms. For example, some common goldfish diseases include fin rot, peptic ulcer disease, Ichthyosis (a skin disease), and liver fluke. If you notice any changes in your fish’s behavior or appearance that seem out of the ordinary, it is best to take them to a vet for an evaluation. Unfortunately, there is no guarantee that you will diagnose your fish accurately, but it is always better to be safe than sorry.

How to Treat Goldfish Diseases

Suppose you notice your goldfish acting strangely or showing the following symptoms. In that case, it’s time to call a veterinarian: refusal to eat, poor swimming behavior, breathing problems, and gill flapping. In most cases, you can quickly treat goldfish diseases with medication. However, surgery may be the only option if the disease is severe or the goldfish is showing signs of pain. 

Regular cleaning of the goldfish’s tank will also help keep them healthy and reduce the chances of them getting sick in the first place. In addition, goldfish are susceptible to various diseases, so they must be treated soon if they start showing symptoms.

How Can I Get My Fancy Goldfish Swim Up to the Top of the Tank?

One of the most common ways to get a fancy goldfish to swim up to the top of the tank is by providing them with proper swimming space. Make sure the aquarium is big enough for your fish, and create several vertical divots at the bottom of the tank. This will give your fish plenty of room to swim around, and they’ll soon learn that it’s best to stay close to shore.