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Fish sideways at the bottom of tank

Subject: Fish sideways at the bottom of tank
by Fisherman667 on 16/8/2019 23:41:24

One of my goldfish refuses to eat and lies on the bottom of the tank of its side. I’m not sure if it’s a disease or ammonia poisoning so I moved it to a temporary bucket in case it infected other fish. Can someone tell me what’s wrong?

Here’s an image: