So, I have 3 albino cory cats with my discus. I have had them for about a year now. One I have had for about 8 years!~

Well, after the new tank change over, on of the smaller corys has bug eye on one side.

I know not what to do. Never had this happen before. We did just go thru a metro 12 day treatment with 90 degrees. Could that cause this?
I guess tomorrow when I do the water change I will take him out and put him (or her) in the QT downstairs.

Any ideas???

VincenZo