Sick Cory, On His Back

[stucolls]

Hi guys, I have just noticed one of my peppered corys on his back on the floor of the tank, he was fine yesterday, he is alive and can swim but as soon as he stops he rolls over onto his back.......
whats wrong with him?

swim bladder?
bacterial infection?

................

 

[damovts]

Hi guys, I have just noticed one of my peppered corys on his back on the floor of the tank, he was fine yesterday, he is alive and can swim but as soon as he stops he rolls over onto his back.......
whats wrong with him?

swim bladder?
bacterial infection?

................

I have the exact same problem with my cory atm

 

[WILDER]

Once fish are on the backs they never seem to recover.
Is he bloated.
Any sores or red streaking on his body.
What do you feed your fish.
Does he look pale or darker in colour.

Size of tank in gallons or litres.
How many fish and which type.
Water stats in ammonia, nitrite, nitrate, and ph.