Book title "Diseases in marine aquarium fish" by GERALD BASSLEER. Pg 40
Eye Cloudiness
Eye cloudiness or mucus formation on the eye occurs in different bacterial and parasitic infections (Crytocaryon, Brooklynella.). Injuries incurred during transportation, dirty water and fights can facilitate these infections. In other cases, eyes protrude or are inflamed. There are many causes for this symptom.
Treatment
The first thing to do is to determine whether any environmental factors are causing these infections. Drug treatment is not always successful because damage may be irreversible. However, good results are sometimes achieved with neomyein, nifurpirinol, or sulfonamides.