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Moving a fish from one aquarium to another is often a shock to their immune system, and it makes them unable to cope with the potentially dangerous organisms that live in most aquariums. The shock is produced by large changes in temperature, pH or chemical makeup. One way to avoid this is to gradually acclimate the fish; I like to use the simple drip acclimation method, which is described on one of our blogs.
Your aquarium could also have a buildup of ammonia or nitrite, both of which are toxic to fish. In an established aquarium, especially one with healthy live plants, beneficial bacteria change the common toxins into plant food. The toxins get there in the first place because of things like over feeding, over crowding, dead plant and animal matter, and lack of maintenance. Beneficial bacteria develop when a new aquarium goes through its nitrogen cycle, which usually takes about a month. Another blog has more information about the nitrogen cycle.
Based on the information in your question, the goldfish is sick, and the move or something in its new environment caused the sickness. My advice is to stop feeding the fish for a few days, and start changing 20 percent or so of the water every day. Be sure to keep the temperature fairly constant and use a good water conditioner when replacing the water. After a few days, things should start to improve, and the goldfish, if he survives, will start to get an appetite. You can go to once a week partial water changes when the nitrite and ammonia reach zero.
I hope some of that helps, and I hope you will accept my welcome to our forum. Please let us know how the goldfish is doing.
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