
Goldfish swimming sideways
Hello everyone,
I need help. So I have a goldfish (Dory) in a tank. It's just a normal tank with slits all over the cover of the tank and a skylight access to feed. We don't have a filtration system installed and I change the water every 21 days.
Today morning, Dory has been swimming sideways and staying immobilized like this and I'm getting worried. Dory has never done this before. So can somebody please help because I'm low-key worried that I might lose her. Which I'm not yet ready to do.
Update: Dory passed early morning. Thank you for your comments.