HELP - Comet goldfish has had this swollen belly for over a year

Fancy goldfish and swimbladder/buoyancy problems - INJAF

Goldfish Dropsy Disease Treatments

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Is my goldfish bloated? Also is a 20 gallon tank too small for him? he just seems so huge but going by what I found online it says it should be fine.

Asymmetrical belly : r/Goldfish

How to Treat Dropsy or Bloating in Fish - hygger

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Ballooning Sarasa Comet