What's going on with my goldfish?

  • We are currently upgrading MFK. thanks! -neo
How old is the tank? What’s ur water change schedule? Sounds like a bacterial bloom. Maybe a mini cycle. I’d do a big water change at least 50% twice a week and start today. I’d add a dose of seachem prime now and with every water change to control the water.

The tank he was in before with my other goldfish was bought earlier this year. I just put him in this tank to quarantine him. I’ve had it around the same time as the bigger one. I do big water changes twice a month and small weekly water changes.
 
Thank you to those who have suggested Furan-2 and Kanaplex. His mouth is almost completely closed now. The one thing that concerns me now is he’s always hanging around at the bottom of the tank and goes to the surface every so often. His back end looks droopy and his fins look kind of red and I’m not sure why. Could someone explain this?

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