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I bought two goldfish last summer and they've been doing great in my 10 gallon tank, but I am starting to wonder about one of the goldfish. I don't know if he is sick, in pain or what.

When I bought these goldfish, one looked normal with skinny body and the other had a bloated or ballooned stomach. I thought this is how these goldfishes suppose to look and never really gave it a second thought, but now I am thinking he is sick.

Bloated goldfish doesn't look or act like he is sick. He is swimming all over the tank, foraging for food. At feeding time both of them swim really fast to the top of the tank and eat all of their food, he is pooping regularly, etc.

I regularly change the water, clean and replace the filter. I would like to know whether he is sick, and if he is what should I do?

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    FYI 45l is pretty if not too small for a goldfish.
    – Kalle Richter
    Feb 11, 2018 at 11:20
  • @KarlRichter what is 45l?
    – ThN
    Feb 12, 2018 at 0:44
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    litres, the SI/world unit for volumina.
    – Kalle Richter
    Feb 12, 2018 at 1:04
  • No. Your fish is fine. strong text
    – Gwen
    Sep 27, 2020 at 20:14

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The egg shaped body is typical for a fan tail goldfish. https://en.wikipedia.org/wiki/Fantail_(goldfish)

You can use a site like http://thegoldfishtank.com/tank-size-calculator/ to size your required tank noting you have one fancy fish and one comet.

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