Two litres of water might fill a fish bowl.
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when you use volume to fill a fish tank/bowl.
Litres.
They might be happy. Or they aren't used to the tank yet. Goldfish also lose their memory every 3sec. (or so I am told) The fish might jut be discovering his tank/bowl over and over and over again
Gallon.Gallon.Gallon.Gallon.
Kilograms, unless it is like a goldfish bowl!