Clown Killi loosing colour

[Dale]

Hi,
We have a few clown killi fish in a well maintained, planted aquarium. They all seem fine except one, which has just started to loose it's colour (it's striped body is becoming faded) and it's scales look slightly raised. It is also not moving around as much as the others. Does anyone know what might be causing this? We've bought some general disease treatment to put in the water tonight that is ok to use with plants, so hope this will work, but wondered if anyone else has had the same problem?
Thanks.

[Nautilus29]

Maybe age? have you checked your nitrates? Are there any other fish in the tank that might be bothering him.

[Chrona]

Raises scales generally indicates either a bacterial infection or dropsy, which is a sympton of many things, like viral infection, internal parasites, bacteria, etc. Does the fish look swollen at all?