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Why did my new aquarium fish suddenly lose its eyes overnight?

Updated On September 23rd, 2025

This is just very wierd and its freakimg me out.i got new fishes yesterday.they were all good. Ate good and everything.i just noticed that 2 of my fishes have lost their eye. idk how.one of them have no eyes at all and they were present yesterday.the other one have only 1 eye.both of them had their eyes yesterday.they just disappeared.and now the fish with no eye is going crazy.also this happened when i turned the aquarium light on for a few minutes.

1 Answer

Most Helpful Answer

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Answered By Todd Cecil

Veterinarian

Published on March 11th, 2019

Thanks for reaching out. Not sure how when the lights were turned on, the fish responded when it had no eyes. Could the corneas be cloudy? This could be due to trauma from an aggressive fish, parasitic infestations, or infections. A veterinary visit would be recommended. If the one has no eyes, it needs to be humanly euthanized as can not find food and will starve to death or succumb to infection. Continue to test water quality and correct any problems. Good luck.

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