Cloudy Eye

Symptoms

Spotting illness early gives the best chance of a cure, so check your fish daily at feeding time. One or both eyes turn cloudy, milky or hazy, sometimes with a film over the surface. The fish may become shy or struggle to find food. If you see several of these signs together, act promptly rather than waiting.

Causes

Caused by poor water quality, physical injury, bacterial infection, or sometimes parasites and old age. Often a warning sign of declining water conditions. In nearly every case the underlying trigger is stress, poor water quality, or the introduction of an infected fish - all of which weaken a fish's natural defences.

Treatment

Improve water quality with regular changes first, which resolves many cases. If it persists, treat with a broad-spectrum antibacterial and check for injury or parasites.

While treating, increase aeration, remove activated carbon from the filter (it absorbs medication), finish the full course even after the fish looks better, and keep the water immaculate with regular changes. Always dose for the tank's true water volume and follow the product instructions.

Prevention

Maintain clean, stable water, remove sharp decor, and quarantine new fish to keep eyes clear. The golden rules are simple: quarantine every new fish for 2-4 weeks, never overstock or overfeed, avoid sudden temperature or chemistry swings, and do regular partial water changes. A stable, clean, low-stress aquarium prevents the large majority of disease.

FAQ

This information is general guidance, not veterinary advice. Consult an aquatic vet for serious cases.