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The fish has a fatal, untreatable disease called dropsey and should be euthanased. This problem is usually caused by very poor water conditions. ie polution due to insufficient water changes or poor filtration or both. To avoid this kind of thing happening you need to do at least 50% water change weekly as well as having a properly cycled filter operating in the aquarium. I hope you are also sticking to the basic rule of 1 inch of fish needs 1 gallon of water. If you are overstocked then you will need to do daily water changes of at least 20% per day as well as a large 75% one on week ends and maybe even more if you wish to avoid constant health problems with your fish.

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16y ago

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