Greetings

[ChrisWilesPhotos]

Hello. I am Chris Wiles just joined. I have a cold water tank 70 litres with six fish in it. They all seem healthy but one goldfish has just begun to get black patches on its fins. Any ideas?

 

[Andrew McFadden]

to AA!

 

[Convict2161]

Welcome to the AA family

 

[Samzter]

Welcome! For more info on your goldfish post in the freshwater section. Your tank is too small for a goldfish by the sounds of it.