My danio left eye looks twice the size of the right

[lewis3456]

Hi I’m looking for a bit of advice my danios left eye is twice the size compared to the right does anyone have any suggestions on what it could be
Kind regards
Lewis

 

[JuiceBox52]

It has popeye.
What are your ammonia, nitrite and nitrate?
What size tank does he live in with what other fish?
Hiw often do you do water changes and how much water do you change each time?

 

[JuiceBox52]

For this to help it heal do a 75% water change every day for 2 weeks.

 

[Colin_T]

gravel clean the substrate too, and clean the filter and wipe down the inside of the glass.