Daughter's goldfish developed a couple of swollen scales. Didn't think too much of it as he doesn't appear sick, eats well, interacts with other 2 gold fish in the tank. Now one of the swollen scales has turned black. He continues to act as if he is fine. We've had him for about 7 years and are quite attached to him and would hate to lose him. Thank you for any advice or knowledge you can share.
Gold fish problem
- Thread starter Vnewbury
- Start date
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Dme071279
Aquarium Advice Newbie
Have you tested your ammonia levels? Could be from the ammonia being a bit high. Also may be a sign of some sort of parasite.
DrWho42
Aquarium Advice Activist
oh no! hope they get better 
Port Captain
Aquarium Advice Newbie
Gold fish are dirty fish and need constant water changes. At least 10% weekly. 1 goldfish needs about 20 gals of water, a second gold fish would need and additional 10 gals. Small tank will need more water changes then a larger tank. Usually the black is an ammonia burn caused by dirty water ( needs 50% changed). I have a fancy tail goldfish in a 50 gal tank and do a 10% change weekly. If I miss a week or 2 the goldfish gets stressed and sits at the bottom of the tank. I do a 10% change and the next day its swimming around happily. Good Luck! I know the pain.
Mother of fish
Aquarium Advice Activist
Welcome! Could be tumors or a cyst?
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