Why Is My Fish Turning Yellow?

Tannins. ... Tannins are present in driftwood, and over time they will leach into the aquarium water, staining it yellow to brown. Tannins lower the pH of the water and soften it. For some fish, this may be desirable and even recommended.

Why did my goldfish turn yellow?

It's very normal for goldfish to turn colours as they grow older, so you shouldn't be worried about that. However, if the scales look fuzzy, slimy, etc, then it could be a fungal infection.

Why is my brown fish turning yellow?

Your Water Has Tannins In It

They are a natural substance that discolors water and lowers the Ph of a tank. In nature, tannins can discolor water and turn a fish habitat yellow or brown as well. The same thing happens in your tank with certain woods and plant material.

Chloe Bennett

Chloe Bennett

Culture, Media & Entertainment Columnist

Chloe Bennett explores the intersection of pop culture, streaming entertainment, digital trends, and contemporary lifestyle. Her weekly commentary reaches thousands of culture enthusiasts.