Club Fin

[safire_eye]

I've just noticed one of my panda corys (the runt of my 5) seems to have some sort of clubbed fin, looks like its wrapped in a tiny bit of cotton wool. Anyone know what this might be and how dangerous it is? Thanks!

 

[safire_eye]

Bump. Found this little cory dead today. Anyone got any ideas? X

 

[soybean]

Cotton wool like stuff suggests a fungus growth.

 

[safire_eye]

I see. Is it just an unfortunate bit of luck, or should I be doing anything extra?