One Of My Pygmy Cories Has Died

[mark.w.jones]

One of my pygmy cories died today from some sort of fungal infection . He had what looked like cotton wool over his mouth / barbels. Is this common in cories.

Checked water stats and cant imagine poor water quality caused it:

Ammonia = 0ppm
Nitrite = 0ppm
Nitrate = 10ppm
pH = 7.6

Do you think he just damaged his mouth whilst rooting around? He seemed to die dreadfully quickly. I noticed it this morning and he had died by the afternoon. Currently treating tank for fungal infections.
Any advice gratefully received.

 

[Tempestuousfury]

Seems to be cottonmouth. Not sure about the frequency of occurence in corydoras. How old was the fish (old = how long in your tank)?

 

[mark.w.jones]

About 6 weeks so tank is fairly new and still maturing. Did fishless cycle so I thought everything was OK.

 

[smithrc]

whats the substrate?