Sick Bronze cory

[Sweety]

Hi I was wondering if any of you could poss shed some light on what is wrong with my bronze cory please. Over the last couple of days he has lost the colour from the rear of his body, he hasn't been swimming around that much lately either. I've had him for about 8 months now & hasn't grown very much either which I know could be just one of those things as i've had bronze cories in the past which never grew as big as the others. I've added a pic of him, he's the one closest to the front glass & you can see the lack of colour towards his tail

[corielover]

I had a bronze and albino cory acting just like yours, losing color too. Unfortunately, they both died I am still searching for a cause, but all the rest of my corys are fine.

[Sweety]

Sadly I had to put that poor little chap to sleep as his swimbladder went a couple of weeks later & he was in a right state & suffering