I have had my pet goldfish for just over a year now, and recently he's started to swim strangely. He won't use his tail at all anymore, and has resorted to wriggling from side to side instead, and some days he just sinks to the bottom as if he's tired out. He isn't bloated at all and his colour is still bright and orangey. His tail isn't damaged either from what I can see, but his swimming has just become more and more pathetic! What's the matter with him? Is there anything I can do for him? Please help- I love this fish!
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