Common Causes
Water quality — high ammonia, nitrite, or nitrate.
Physical injury from fights or tank accidents.
Bacterial infection — usually secondary to injury or poor water.
Water-Fix Protocol
50% water change daily for 5 days. Test ammonia, nitrite, nitrate.
Add aquarium salt (1 tsp per 5 gal) — helps slime coat recovery.
Medication if Needed
If cloudiness persists after water improvement, dose Furan-2 for 7 days.
Bilateral cloudy eye with pop-out often needs Kanaplex.
Recovery
Most eyes clear within 1-2 weeks of water improvement and/or antibiotic.
Permanent clouding occasionally persists — usually no impact on quality of life.