Black spots on goldfish

[happy_jack]

HI ,
Had trouble with our fish and 7 of them died in the past month . Anyway the last remaining goldfish has had a black spot on it & today he has several all of a sudden . The water is fine . What do I need to do ? Thank you. George

 

[Butterfly]

What size is your tank, what are the water test readings (Ammonia, Nitrites, Nitrates). The best thing to do when a problem arises in a tank is to do water changes or multiple water changes. Goldfish are heavy waste producers.
Carol

 

[Fish Ace]

You have forced you fish to breed by temperature changes but there is no male.

 

[Gunnie]

You have forced you fish to breed by temperature changes but there is no male.

How do you know that when he didn't mention any temperature change?