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Swallowing a stone will not sink a goldfish and they are not likely to do that anyway. They know what is food and what is not. The reason a fish sinks to the bottom is because it is very sick. I would guess the fish is probably dying or dead through being kept in bad conditions. The basic rules for keeping fish well and healthy are :- "1 inch of fish needs a minimum of 1 gallon of water , a permanently running cycled filter and at least 50% of its water changed every week". If you didn't comply with any of the above that is what is wrong with your fish.

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15y ago

What else can I help you with?