Why are my fancy goldfish lethargic, bloated, and at the bottom?

Question

I noticed my two fancy goldfish are lethargic, one is small ryukin, and other is oranda. They stay at the bottom of the tank. furthermore, their bellies are swollen, and their tails are droopy; the two fish are not active like other six fish in a 50 gallon tank. I did overfeed them, but now I cut back feeding. I thank you for your advice and assistance. Pet's info: Fish | Unknown - Fish | Male

Angel Alvarado, LVT · Accepted Answer

They may be bloated or constipated from the overfeeding. Fast them for 1-2 days then offer bits of shelled green peas. Once they begin defecating normally, you can switch back to a flake or pelleted diet. Check the water quality. Goldfish produce a heavy bio-load. This, in addition to 6 other fish, may be overburdening your filter. Water quality will suffer. Ammonia and nitrite levels, if elevated, can be toxic and cause the symptoms you are seeing. A properly cycled and filtered tank should have 0 ppm (parts per million) ammonia and nitrites with nitrates at 40 ppm or less. Water changes and/or chemical treatment may be indicated to correct imbalances. The filter should be one that can handle twice the volume of the tank. Another consideration would be increasing the tank size or removing fish. The tank may be overcrowded now which will can stress fish.

Why are my fancy goldfish lethargic, bloated, and at the bottom?

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