red scalely disease

[gourami]

Hi,

I have a 33 gallon tank with 4 black skirt tetras, an algea eater, 1 blue gourami and two other small fish that I got from a friend (so I don't know what they are). I've had the tank for a long time. All the fish are healthy except the gourami which now has a red scalely disease on one side of his body. He's still swimming and eating although not as much as he used to.

Can someone tell me what's wrong and how to treat it?

I've had problems with PH before but that's under control now and has been for quite some time.

Thanks,

 

[dolphin]

Hi gourami

Firstly to the forum.

Are the scales red, or is the area around and under the scales red. If it is the last, it could be a bacterial infection.