Best answer
The most likely cause ispoisoning. Eating a dead fish can lead to serious health problems like vomiting,diarrhea,and nausea. In some cases,it can even lead to death.
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What happens to other fish when a fish dies?
And the last thing you want for your other fish is to start consuming the decaying particles of the dead fish. Even if your fish died of old age, the main risk would be the release of ammonia which will also pollute the water in your tank. The other fish in the tank will react to the water being polluted, and so might die from being overstressed.
What happens if you eat bad fish?
What Happens When You Eat Bad Fish? WebMD explains that scombrotoxin poisoning is an allergic illness caused by the ingestion of spoiled fish. Symptoms include a burning sensation inside the mouth, dizziness, diarrhea, headache and an itching rash.
How to get rid of a dead fish in a tank?
Remove the corpse of the fish from the tank. Use a fish net such as this or a similar one to remove the corpse of the dead fish (here another option to check on Amazon). Try not to use your hands as you still don know what the fish has died from. If you do happen to use your hands, wash them thoroughly after.
Can dead fish spread diseases to other fish in the tank?
Having a dead fish in your aquarium can spread fungal, parasitic and other infectious diseases to other fish in your aquarium. A dead fish that died of a disease can become a carrier of illnesses in a tank.