https://www.chewy.com/education/fish/health-and-wellness/what-causes-cloudy-eyes-in-aquarium-fish
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Several factors can cause cloudy eyes in aquarium fish. Internal parasites like protozoa or flukes are one possibility, while cataracts can also develop in fish, although there are currently no known treatments for these conditions.
Eye injuries can become infected by bacteria, which are often treatable with a quality antibiotic. In some cases, poor nutrition - such as a vitamin A deficiency - can negatively impact eye health in fish.
The leading cause of cloudy eyes in aquarium fish is often poor water quality, especially when the pH level falls too low. This issue is particularly frequent in tanks housing large fish, as they generate a considerable amount of waste. During the biofiltration process, this waste breaks down and produces acids, which over time can significantly reduce the pH.
The rate at which the pH drops depends on the chemical makeup of your local tap water, but in aquariums with a heavy bioload, this decline can happen quite rapidly.
The good news is that the solution is usually straightforward. Check your aquarium’s pH levels. If it’s below 6.8 - and particularly if it’s under 6.4 - increase the frequency of water changes.
In many cases, restoring proper water conditions is enough to allow your fish to recover without the need for medication. If the issue persists, you can explore other potential treatments.
Chewy editorial team offers helpful insights like these to guide aquarium owners in maintaining a healthy environment for their fish.
