Silver Dollar with cloudy Eye, risk to other fish

[jumpin joe fish]

I have 9 silver dollars in a 125 gallon tank, along with 2 severums, 2 nicaraguensis, 2 clown loaches and a pleco and 4 congo tetras. One of the silver dollars has a cloudy eye.I do 40% water changes once a week and all my levels are zero and my nitrate is around 25-40 usually. Is cloudy eye caused by poor water quality? Is there a risk to my other fish who appear to be doing ok, including the clown loaches, which I hear are more sensitive to
water conditions than my other fish. Should I get rid of the fish to stop possible spreading or tank contamination? Any ideas for cure?

 

[Lupin]

Cloudy eyes are caused by poor water quality. Other fish shouldn't be at risk but if you try to increase your tank maintenance frequency, you can prevent it.

 

[guppy]

Cloudy eye can also be caused by a scrape or injury of the eye followed by an infection. while it is not needed to quarantine you may wish to do so and treat with a product such as Binox, or a combo of Maracyn and Maracyn 2.

 

[Dr. Giggles]

Another possibility is if you had a pH drop which will cause "acid burn". Check your pH. Check the eyes for possible worms.