Fish Care

Black Moor Goldfish Tank Size: What You Need to Know

Black Moor Goldfish Tank Size

If you are considering getting a black moor goldfish as a pet, it is important to know the appropriate tank size for this type of fish. Black moors are known for their large, bulging eyes and can grow up to 10 inches in length. As a result, they require a spacious tank to thrive and stay healthy.

The minimum tank size for a single black moor goldfish is 30 gallons. However, it is recommended to provide at least 10 gallons of additional space for each additional fish.

This means that if you plan on keeping two black moors, you should have a tank that is at least 40 gallons in size. It is also important to note that black moors are messy eaters and produce a lot of waste, so a larger tank size will help maintain good water quality.

In addition to tank size, it is important to provide proper filtration and regular water changes to keep your black moor goldfish healthy.

A good rule of thumb is to change 10-20% of the water in your tank every week. By providing a suitable tank size and proper care, you can ensure that your black moor goldfish thrives in its new home.

The Right Tank Size for Black Moor Goldfish

If you are planning to keep Black Moor Goldfish as pets, it is important to provide them with the right size of tank.

Black Moor Goldfish are known for their large and bulging eyes, which can make them more susceptible to eye infections and injuries.

Therefore, it is crucial to ensure that they have enough space to swim around and avoid bumping into tank decorations or other fish.

Why Tank Size Matters

The size of the tank can have a significant impact on the health and well-being of your Black Moor Goldfish.

If the tank is too small, it can lead to stress, stunted growth, and an increased risk of disease. Additionally, a small tank can result in poor water quality, which can further harm your fish.

On the other hand, a larger tank can provide more space for your Black Moor Goldfish to swim around and explore. It can also help to maintain better water quality, which is essential for the health of your fish.

Factors to Consider

When choosing the right tank size for your Black Moor Goldfish, there are several factors to consider. These include:

  • The size of your fish: Black Moor Goldfish can grow up to 10 inches in length, so it is important to choose a tank that can accommodate their size.
  • The number of fish: If you plan to keep multiple Black Moor Goldfish, you will need a larger tank to ensure that they have enough space.
  • Filtration and aeration: A larger tank will require a more powerful filtration system and aeration to maintain good water quality.
  • Decorations and plants: If you plan to include decorations and plants in your tank, you will need to factor in their size and how much space they will take up.

Recommended Tank Sizes

Based on the factors mentioned above, the following table provides a general guideline for the recommended tank sizes for Black Moor Goldfish:

Number of Fish Tank Size
1 20 gallons
2 30 gallons
3 40 gallons
4 50 gallons

It is important to note that these are just general recommendations, and you should always consider the specific needs of your fish when choosing a tank size. Additionally, it is always better to err on the side of caution and choose a larger tank if you are unsure.

Setting Up the Tank

When it comes to setting up a tank for your black moor goldfish, there are a few things you need to keep in mind. In this section, we will cover the basics of tank placement, filtration system, substrate, and decorations.

Tank Placement

When choosing a location for your black moor goldfish tank, keep in mind that they prefer cooler water temperatures. Avoid placing the tank in direct sunlight or near a heat source.

A cool, shaded area is ideal. Also, make sure the tank is placed on a sturdy, level surface that can support the weight of the tank when it is full of water.

Filtration System

A good filtration system is essential for keeping the water in your black moor goldfish tank clean and healthy.

The filter should be able to handle at least double the amount of water in the tank. For example, if you have a 20-gallon tank, the filter should be able to handle at least 40 gallons of water. Consider using a canister filter or a power filter with a bio-wheel for best results.


Black moor goldfish are bottom-dwellers, so it’s important to choose a substrate that won’t harm them. Avoid using sharp gravel or sand that can scratch their delicate skin.

Instead, choose a smooth substrate like river rocks or rounded pebbles. Aim for a depth of 2-3 inches of substrate.


Decorations not only make your tank look more attractive, but they also provide hiding places for your black moor goldfish.

Choose decorations that won’t harm them, such as plastic plants or ceramic ornaments. Avoid decorations with sharp edges or rough surfaces that can injure your fish.

In summary, setting up a tank for your black moor goldfish requires careful consideration of tank placement, filtration system, substrate, and decorations. By following these guidelines, you can create a safe and healthy environment for your fish to thrive in.

Maintaining the Tank

To ensure the health and happiness of your black moor goldfish, it’s crucial to maintain the tank properly.

This section will cover the key aspects of maintaining your black moor goldfish’s tank, including water quality, feeding schedule, cleaning, and maintenance.

Water Quality

Maintaining good water quality is essential for the health of your black moor goldfish. The ideal pH level for black moor goldfish is between 6.5 and 7.5, and the ideal water temperature is between 65-72°F (18-22°C).

Use a high-quality water filter to keep the water clean and clear. Test the water regularly using a water testing kit to ensure that the water is safe and healthy for your fish.

Feeding Schedule

Black moor goldfish are omnivores and need a balanced diet to stay healthy. Feed your fish twice a day, giving them only as much food as they can eat in a few minutes.

Overfeeding can lead to health problems, so be careful not to give your fish too much food. A balanced diet for black moor goldfish includes high-quality fish flakes, pellets, and freeze-dried or live foods such as brine shrimp, bloodworms, and daphnia.

Cleaning and Maintenance

Regular cleaning and maintenance of your black moor goldfish’s tank are essential for their health and happiness.

Change 25% of the water in the tank every two weeks to keep the water clean and fresh. Use a siphon to remove any debris from the bottom of the tank. Clean the filter every month to keep it working properly. Check the temperature and pH level regularly and adjust as needed.

In addition to regular cleaning and maintenance, it’s also important to keep an eye on your black moor goldfish’s behavior and health. Look for signs of illness, such as lethargy, loss of appetite, or abnormal swimming behavior. If you notice any signs of illness, take action immediately to prevent further health problems.

By maintaining the tank properly, you can ensure that your black moor goldfish is healthy, happy, and thriving in their environment.


In conclusion, a black moor goldfish requires a tank that is at least 20 gallons in size. It is essential to provide enough space for the fish to swim and grow comfortably.

When choosing a tank for your black moor goldfish, keep in mind that they are messy eaters and produce a lot of waste.

Therefore, you will need a filter that can handle the waste produced by your fish. A filter with a flow rate of at least 10 times the volume of the tank per hour is recommended.

Additionally, black moor goldfish prefer a cooler water temperature of around 65-72°F. Therefore, it is important to choose a tank that can maintain a consistent water temperature within this range.

When decorating your tank, make sure to provide plenty of hiding places and plants for your black moor goldfish to explore and play in. Avoid using sharp or rough decorations that could harm your fish.

Overall, providing a suitable tank and environment for your black moor goldfish is crucial for their health and well-being. By following these guidelines, you can ensure that your fish thrives in their home.