2 Of My Cories Died!

[Tim13]

Hey, I had 5 panda cories in my 10 gallon and one of them died the other day. Shortly before he died his eyes looked sunken in and he looked really thin.

I thought there just might have been something wrong with him because all of my other fish are ok and the water stats are fine.

Then I come home tonight and another one is dead. I have 2 left and one of them that are still left looks like his body is a little curved. What could be the problem they don't have any marks or anything on them. The water stats are fine. Ammonia and Nitrite 0 and nitrate 20. And I also have other fish in the tank that all appear to be fine.

 

[WILDER]

it could be old age, fish tb, internal parasites, vitamin defiency.
Issolate the corys immediately just to be on the safe side.

What does it look like when the corys go to the toilet.
Is there anus enlarged or red and inflamed.
Is there belly sunken in.
Do the corys lay on there sides or swim on there sides.