what could have cuased my janitor fish's death?

  • Thread starter Thread starter CyFox
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CyFox

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when i was a kid,i had this janitor fish.i keep it with 6 goldfishes and 1 angel fish in a 20 gallon tank.

I know that it isn't right.but understand that i was still very young then.that janitor fish just died one day.i looked on its underside and i noticed there is an empty hole in its belly.Is that normal?what could have caused it?
 
Maybe it had to much food- a few years ago me and my brother got twenty fish and they all died within two days because we put a LOT of food in the tank. Also it could be the water quality or that the fish was sick or something.
 
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