Why is my Black Moor Turning Gold Orange Color?

Blackmoor goldfishes are one of the popular goldfish species you’d find in most largely-visited aquariums. This is because their physical appearance and beauty are always captivating to watch.

It is very common for a black moor goldfish to turn orange colour, Most of the time it does not necessarily mean that there is a problem. Some times they change colour because of water conditions, If this is the case you will need to check certain water elements.

Why is my Black Moor Turning Gold Orange Color

That deep black coloring, punctuated by its huge eyes elicit excitement from anyone who watches them through the tanks. If you own one, you’d do anything in your power to see them live a long, happy and healthy life.

It is quite surprising and a cause for concern when you wake up one morning to see your matte black moor spotting a gold-orange color. While your fish might be healthy and bumbling with life, we are never restless when it begins to change colors.

There are a number of reasons why this is so. We’ll be exploring them briefly.

1. Velvet Disease.

Do not be fooled by the fancy name. Velvet disease is one of the most common diseases most fishes experience. This happens too fast for aquarists to spot and remedy on time.

It is often characterized by a dusty, yellowish speck on the skin of the black moor. It also appears as a gray-yellow tinge on the skin; a reason why it is also called gold-dust or rust disease.

Velvet diseases manifest when a dreadful parasite, Oödinium, swims with the aid of the flagella and attaches itself to the unsuspecting black moor. It penetrates the skin of the fish and gets into the cells of the fish and begins to feasts on the nutrients inside.

After maturing for a while, it begins to form a reproductive cyst, which multiplies in hundreds and released inside the water in search of new hosts.

If they don’t find a host within a 24-hour window, they wither off and die. Oödinium manifests by producing golden spots on the fish, almost similar to Ich, but much finer.

The fact is that Oödinium may already be present in most commercial aquariums.


There are factors that are responsible for this problem to manifest. Some of them include:

  • Changes in the water temperature
  • Introducing untreated plants containing cysts.
  • Unchanged tank water
  • Introducing new unquarantined fishes to the tank.


  • Scratching its body against the tank or hard objects. In a bid to dislodge the parasite, black moors will rub their bodies against any hard surfaces it can find.
  • They become lethargic. As the diseases eat deep into their skin, they begin to lose energy and appetite altogether. Also, they are going to experience problems with breathing resulting in increased gilling.
  • A velvet, golden or yellow tinge. At first, this tinge may be difficult to see, but if you point a flashlight toward the fish in a dark room, you can spot the parasite. Oödinium can also affect other areas of the fish including fins and gills. They are also known to affect fish fry that is only a couple days old.


Velvet disease is extremely contagious, as it could a couple of fishes in less than 3 days. Therefore, it is absolutely necessary to carry out treatment plans as soon as you’re sure it’s velvet disease.

  • Raise the temperature of the water in the tank. Expert studies suggest that the parasite’s life cycle is accelerated due to heat. You’re expected to increase the tank temperature to 80° Fahrenheit.
  • Treat your affected fish with copper sulfate. You should follow the manufacturer’s instructions to treat the affected fish for a duration of 10 days. This ensures that the parasite is eliminated completely. Other medications include Quinine salts, methylene blue, and Atabrine.
  • Oödinium is a parasite that manifests and is hugely dependent on light. Hence, it is recommended to dim the light for a couple of days, as this would lower the infestation.
  • Remove carbon filtration from the tank during treatment. Filters are counterproductive when treating your black moor goldfish of velvet disease.


Preventing such diseases from ever occurring, you must carry out the following:

  • Quarantine new fish. It is important to quarantine new fish for 14 days before introducing it to the tank containing other black moors.
  • Quarantine infected fish in another tank.
  • Regularly change the water
  • Ensure that the fishes are properly fed.


This is a natural occurrence that rarely happens with black moors. Some black moors are naturally predisposed to change their color after a while, as a result of hereditary and poorly maintained breeding lines.

Hence, regardless of the environment, they are bound to change their color at some point in their lives. If you notice that your fish isn’t lethargic or experiencing loss of appetite, then it could be this natural occurrence. Nothing to be worried about.

3.Bad water chemistry

Another reason why black moor turn gold-orange is due to the bad chemistry of the water as a result of overfeeding. When you overfeed your black moor, the tank will be filled with uneaten food. And coupled with released waste will make the water unbearable for the fish to thrive.

It is important, therefore to check and change the water regularly. You can also perform a nitrogen cycle to ensure that the levels of nitrates and ammonia remain at 0 ppm. At least 25% of the water should be changed on a weekly basis.

4.The temperature of the tank

The temperature of the tank can, in several ways, affect the color of your black moor. Black moors thrive in temperature not higher than 72° Fahrenheit. If your tank is located beside a window, it might be advisable to move the tank to another location, especially during the summer.

This is to ensure that direct sunlight through the window doesn’t increase the temperature. It is also recommended that you move the tank away from any heating equipment such as microwaves, ovens and any electrical or mechanical appliance that generates heat.


Black moors goldfishes are delicate creatures that should be properly taken care of, so they can thrive and live healthy. Once you begin to spot gold orange tinges on their skin, carry out these treatment and preventive measures to save them.

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