Why does my goldfish look dirty?

Ammonia changes are, by far, the most common reason why goldfish turn black. Generally, the color change starts on the fins. Over time, it can get progressively worse and spread to the body. There, it'll appear as small batches of black skin that look burnt.
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What is the black stuff on my goldfish?

Black patches on a goldfish sometimes signify that his tank water was overdue for a change. Fish waste, uneaten food and plant debris create ammonia, a toxic chemical. If tank water isn't changed frequently enough, ammonia builds up and burns fish skin.
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What does a sick goldfish look like?

Weakness or listlessness. Loss of balance or buoyancy control, floating upside down, or 'sitting' on the tank floor (most fish are normally only slightly negatively-buoyant and it takes little effort to maintain position in the water column) Erratic/spiral swimming or shimmying.
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Why does my goldfish have brown spots?

Brown or black flat spots and patches on goldfish are a sign of ammonia burn from spiking ammonia levels. The discoloration is a sign of healing, but elevated ammonia levels can kill fish. Small, distinct, raised brown or black spots or bumps are fish lice, a parasite that targets goldfish.
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What are the signs that your goldfish is dying?

Identify symptoms of a dying goldfish.
  • The best time to check for signs of disease or death is before feeding.
  • Breathing disorders: look for symptoms such as gasping for air, rapid breathing, skimming the surface of the tank water, or lying at the bottom of the tank, which may indicate disease or poor quality water.
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Why do Goldfish Tanks Get Dirty Fast? - How to Get Rid of Algae?



What kills goldfish in a tank?

Chlorine and chloramine are additives in tap water that can kill goldfish as well. These get into your tank if you perform water changes and add untreated tap water to your tank. You should always use chemical additives that remove chlorine and chloramine from water before you add it into your tank.
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How often should you feed goldfish?

Feed 2-3 times daily. It is important to avoid overfeeding goldfish as this can cause indigestion and/or contaminate the tank. In terms of the amount to feed, a good rule of thumb is to only feed an amount that the goldfish can consume in under two minutes or only feed as much as the size of the goldfish's eye.
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What is the brown stuff on my fish?

Brown Silica Algaes (Diatoms)

"Brown Algae" is the common name that refers to the diatoms, Class Bacillariophyceae, that find their way into both freshwater and saltwater home aquariums.
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How often should you change goldfish water?

A goldfish bowl without a filter should be cleaned twice a week. With a filter you can clean it every 7-10 days. How do I clean my bowl? Remove 1/3 of the water and put it in a different container.
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What does ammonia burn look like on fish?

Red or Purple Gills and Bloody Patches

The fish's gills will take on a red or lilac color, making them look like it's bleeding. As the problem progresses, the fish's tissues will begin to deteriorate, evidenced by red streaks or bloody patches on their body and fins caused by ammonia burns.
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How do I reduce ammonia in my fish tank?

To lower ammonia levels in a fish tank, do weekly partial water changes, removing around 30% of the water in the tank and replacing it with fresh, dechlorinated water. You should also scoop out any organic matter that shouldn't be in the tank, like uneaten food, fish waste, and uneaten plant matter.
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Is it normal for goldfish to lay on the bottom of the tank?

You indeed have a problem when a goldfish is bottom sitting. Possible causes are ammonia spikes (filter issues, changes in temperature, pH etc, a high volume of nitrates, overcrowded tank - causes most of these problems (40-50 gallons per common goldfish are needed).
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How do I get rid of ammonia in my fish tank?

One of the easiest and most efficient ways of lowering ammonia levels is by performing one or more water changes. Water changes will immediately remove the ammonia from the fish tank and introduce safe water that will help dilute the remaining traces of ammonia left in the system.
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Why does my fish have black stuff on it?

Author Note: These black spots are actually parasite eggs that burrow into the skin. Once they're in the fish, the eggs will develop into hard black cyst for protection. Eventually, the spots will burst as the parasite is released (ew).
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What is a life span of a goldfish?

Goldfish have a lifespan averaging about 10-15 years, with some varieties living up to 30 years when provided with proper care. Unfortunately, many goldfish do not reach their lifespan potential due to inadequate housing conditions. Housing needs to meet both their behavioural and physiological needs.
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Why do goldfish turn from black to gold?

If you own goldfish, chances are you have likely noticed that sometimes they change color. This can be caused by a variety of factors – diet, amount of light exposure, genetics, maturing and aging, water quality, or in some cases disease or illness.
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How do I keep my goldfish water clear?

Begin by scraping away excess algae from the tank sides with an algae scraper, and then vacuum up any waste or food scraps accumulating on the floor of the tank. Finally, siphon out 20 percent of the tank water and replace it with fresh water that has been treated to remove chemicals and chlorine.
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How do I keep my fish bowl water clear?

Add activated carbon media to the filter, whether loose or carbon pads. Adding activated carbon media or activated carbon pads to the filter will help clear the water and adsorb nutrients that feed the bacteria bloom.
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Can I put goldfish in tap water?

Can Goldfish Live In Tap Water? Tap water is the most commonly used water in goldfish tanks. So YES, goldfish can live in tap water as long as it's been treated with a water conditioner first.
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How do I get rid of brown algae?

Bleach. If your tank decorations are coated with brown algae, soaking them in a bleach solution every few weeks will help. They'll need to be rinsed thoroughly with water or soaked in water for a few hours to neutralize the bleach before putting them back in the tank.
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Why does my fish tank get dirty so fast?

Use the Right Size Tank First, be sure your tank is the proper size for the fish you keep. If your tank is too small, the fish will be stressed and the tank will get dirty much faster. Your tank should not be overly large, however, or the fish will be uncomfortable and it will be much more space to keep clean.
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What causes brown algae?

Brown algae is actually formed from billions and billions of microscopic creatures called diatoms. These creatures intertwine and form the clumpy brown patches that invade your fish tank; sticking itself to the glass, plants and equipment installed in your aquarium.
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What is better for goldfish pellets or flakes?

Pellets. Almost all goldfish diets will start with the pellet vs. flake debate. Very small fish will likely need to start with flakes, but as soon as your fish graduate to having a mouth that can handle a small pellet, it is better for their overall health.
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How do I know if my goldfish is hungry?

How To Tell If Your Fish Is Hungry
  1. Your fish is digging around the substrate (searching for food).
  2. Waiting and the top of the aquarium (for feeding time).
  3. Behavior changes (aggression).
  4. Noticeable weight/size changes.
  5. Slow or sluggish behavior.
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Is LED light good for goldfish?

Aquarium light types include fluorescent, LED, or UV lighting. All of these are suitable for use with goldfish and work well as a permanent lighting system. You want a light that has more of an orange glow than one that has a bright white output as this is gentler on their eyes.
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