Corydoras eye cloudy!

Thank you for all the information!

I will not give him any more salt, thank you!


I will get some photos in a minute!

I added a bit on the the message you quoted, he is breathing quite fast, is that to do with water quality?

Edit: What temp. should it be?

Breathing fast may just be stress, they do pant if freaked out, like after being chased with a net and caught, or if he's alone in a bare tank. Is the tank he's in now bare? What size is it and does it have a filter?

Temp - what temp is the main tank at? Panda cories should be kept at 72 to 77°F (22 to 25°C), refer to Seriously Fish for species information in future.
 
The tank he is in is 25 litres I think. It has gravel( I know gravel isn't good, I don't have any sand available) plants, and a filter, heater, and a couple of pebbles. I will post a picture with the picture of him.

The main tank is 23 degrees C.
 
I agree with @AdoraBelle Dearheart here. Keep the temperature in the range of 23-25/73-77F. Absolutely no warmer (unless treating for ich or velvet, that's another matter). Increase the flow from the filter so there is a good (but not excessive) current in the tank. This fish occurs in the Rio Aquas and Rio Amarillas (tributary of Rio Pachitea), Rio Ucayali system, upper Amazon in Peru. Water flow is somewhat faster in these mountain streams, with cooler temperatures.
 
I have temperature at 24° C now, accidentally turned it too high! It is back down now. Here are some photos:
 

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He is still breathing quickly, I don't think he has eaten anything, I just did a 75% water change. He is just sitting there.

When he went to get air from the top, he came back down, but the air was still trapped in his system, so he couldn't reach the substrate. I watched for a minute and he expelled it, but it looked like it came from behind his anal fin.

Anything else I should be doing?
 
When he went to get air from the top, he came back down, but the air was still trapped in his system, so he couldn't reach the substrate. I watched for a minute and he expelled it, but it looked like it came from behind his anal fin.

This is basically normal. When a cory breaches the surface it takes a gulp of air, and while on the way down in the water it swallows the air. As he is swallowing the air, the former gulp of air is expelled through the vent. Blood vessels in the gut assimilate oxygen from the air bubble.
 
What can I do to make him eat? And does anyone think it is internal parasite or bacteria?

He is still breathing quickly as well!
 
Could be flukes, there is such a thing as eye flukes. Not eating and breathing fast can also be signs of flukes. Perhaps Prazipro would be helpful.
 
What would I do to treat the flukes? If it is that. Except the medication.

I will continue to do large water changes as well.
 
It's cloudy eye almost looks as if it is sunken! I am going to pick up some medication for flukes.

EDIT: Both of his eyes look sunken!
 
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I got this medication as the other one shouldn't be used for corydoras apparently!
 

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Personally I think it is a bacterial issue.
Don't know what triggered the infection but eye problems could point towards a onesided diet and the lack of certain minerals / vitamins. Doesn't mean it is caused in your tank btw.
Another possibility could be the eye is damaged by the substrate making it vunerable for bacteria.
 
Unfortunately he died. I researched flukes and spoke to the manager of the specialist aquatic store, and they both thought it would be flukes.

Thank you everyone for your assistance. I have treated the main tank with this as well as I think my other female corydoras has it as well.
 

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