When you buy through links on our site, we may earn a commission. Learn more. Did you know that goldfish can turn black over time? In this guide we talk about the most common reasons why you fish may be showing a dramatic color change and what you should do about it.
The simplest and most likely reason is that your goldfish is simply maturing! They are notorious for shifting in color over time. They may change to a black patchy pattern, grow in white scales, or turn entirely greenish brown or black.
While the fish was in a bucket waiting to go back into his aquarium, he instantly turned orange again. Going back into the tank he turns black. So, I put him back in the bucket, and started treating the water in the tank.
I followed the lifeguard instructions and treated the tank with it for six days. Then I did another complete water change and changed the filters. When I put my fish back in the tank, he started turning black again.
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Share this How Big Can Goldfish Get? Comments I went to the pet store and asked the folks there about my goldfish turning black. I have two gold fish in my tank and only one fins is turning black.
Should I be concerned? My one goldfish some of scale is turning black should I worry? Should you go to the vet? Is your little goldie going to make it? There are multiple reasons that could be the cause of your goldfish turning black.
First off, all fish have different cells in their skin. Some of cells produce a black pigment called melanin, which naturally could be the cause of your goldfish tail turning black. It could also be the cause for scales turning black. If you have your goldfish in an aquarium that has a dark backdrop — such as dark wall paper or a dark 3D background — your goldfish could start producing more melanin than normal.
The reason? Your goldfish is naturally blending into its background. This is a safety thing built in for the protection of fish that are otherwise easy prey for certain larger fish. This coloring could be across the whole body or it could be in patches along the scales, tail, or fins. This kind of color change is totally natural and absolutely nothing to worry about.
There are many goldfish species that are blended breeds — meaning they have not been carefully bred to maintain specific qualities, such as coloration. Water snails carry a disease called black spot. Eggs of a parasite burrow into fish skin and protect themselves by forming a hard, dark cyst.
This causes dark patches on the fish skin. The disease doesn't affect adult fish badly, though they may show irritation by flicking their bodies. Removing snails from the aquarium breaks the parasite's life cycle. There are lots of attractive fish tanks available. Buy the biggest you can afford.
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