Sick Cardinal Tetra

[Bluethumb]

I had a cardinal that was really fat and happy. It always ate like a monster. But suddenly it stopped eating. It had no interest in food what so ever. It had these white silky patches on its caudal fin right after the red ended. It did die, even with massive water changes. Does anyone know what it could have been? Thanks

[Bluethumb]

I'm adding to it: it was full grown and had been in the tank for more than a year. It was in a 10g tank.

[Delapool]

Did you check water specs at the time? Eg ph, nitrates, etc in case of mini cycle, etc. Was there any change in the tank to trigger it do you think? New plants, warm weather, etc, etc.

[Bluethumb]

Yes, I did check and it was normal. There wasn't anything new.

[Delapool]

It may have been bacterial or fungal infection but something would of set it off (even if most of the time we don't know what).

[Bluethumb]

Thanks for the info

[MICEY]

tetras don't live very long it might have died of old age

[Bluethumb]

That could have been it, but it had white silky things in its tail, which could have been something else.