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Yes. It can seriously harm a goldfishes intestines if eaten and can cause fatal diseases to their brain or stomach if its fumes were inhaled. Green Algae is OK for fishes to be around but if excessive algae grows in tank then it could, too, be fatal.

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14y ago

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Is black algae harmful to fish?

Yes, black algae can be harmful to fish as it can compete with them for oxygen and nutrients, leading to stress and potential health issues.


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