01-23-2008, 03:09 AM
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That fish has a swim bladder problem, that is very obvious. He's having a hard time staying down low in the tank, and the twitching is his struggling to do so. The best treatment I know for this is epsom salts, it usually works fast. What kind of food are you offering him? If he is feeding at the surface he will gulp a lot of air, which will cause this. If this becomes ongoing, it can cause internal damage.
Always feed fancy goldfish with food that sinks to the bottom. If you can't find any pellets that sink, soak the floating pellets in water until they are water logged enough to sink to the bottom of the cup, then feed them to the fish.
Add 1 teaspoon of epsom salts to the tank, don't dissolve them in water first, just sprinkle it in. Withhold that day's feeding and see if you can get the fish to eat one or 2 pieces of the epsom salt first, this will help a lot faster. Keep the water cool (65 - 68 degrees) and very clean (50% water change every day) and he should be fine in a few days.
The other advice I have to offer is this: start shopping for a much larger tank already now. These fish grow fast, and are very dirty, also consume a large amount of oxygen. Fancy goldfish grow to 8 inches, and to go from the size yours is to about 3 - 4 inches in the first year should be expected. You'll want at least 40 gallons for the first year or so, then up to about 75 gallons after that for the one fish. If you add another, 90 gallons would be enough for 2.