#black ghost knife fish

My ghost knife is about 20cm (7 inches). We’ve had him for about a year and a half. He’s got some white patches over his body, today we did a 30% water change and the patches got worse and could be seen more vividly. The patches come and go. His behaviour is fine and he doesn’t act sick (I don’t...

I got a new black ghost a couple of hours ago. I currently have him in a 10 gallon tank, hes about 3 inches and i'm planning to shift him into a bigger tank as and when he grows. temperature is about 26 degree Celsius. He is the only one in the tank as i was scared to leave any other fish with...