Goldfish trouble could be anything from oxygen deprivation to ammonia poisoning, indicating a broken cycle or spike caused by increased feeding. Trouble with goldfish can occur when fish are cared for properly, as just like other animals, fish sometimes develop issues that stem from genetics
Goldfish trouble after moving fish Goldfish trouble first began a few weeks ago when I moved fish from 2 gallon to 5 gallon set up. The new set up has a filtering system, and there is gravel on the bottom. I feed two or three times a day. The fish are each close to 2 1/2" from head to tail. There's no top of the tank. It's a hand me down aquarium and the lid if cracked so I trashed it. I haven't medicated because I don't know what's wrong with the fish. Goldfish trouble I add little salt to the fresh water every time I clean the aquarium, but just a sprinkle. I heard this keeps the water from going bad. I clean the entire aquarium once a month adding fresh water with water treatment that removes chlorine. Trouble with goldfish The fish were happy in the 2 gallon aquarium, but I knew they were growing and needed more space. They were okay for the first week, and now they're quiet and won't eat or swim around. It looks like their colors are fading if that helps. I've tried to take photos but they're blurry and you can't really see the fish very well Both fish are called shubunkins. They're really beautiful, and I'm greatly attached to them, so any help I can get would be much appreciated. I don't have a test kit. Not sure what to get or what I need in that department.