A goldfish that is healthy will swim around with their fins up and behave as you expect a fish to behave.
When a fish is ill, it may spend all of it's time sitting on the bottom of the tank, they may have their fins clamped against their body, or they are surfacing at the top of the tank for air.
There may also be other signs such as a problem floating upright, blood red streaks in their fins, fungus on their body, sores, or even torn fins just to name a few possibilities.
It is probably sick
Obviously they can get sick just like any other creature.
they might get the "ICK" or they can get sick from there bowl or tank not being clean
Sometimes maybe when its sick or something.
because they are sick dummy
If your goldfish eat a lot it means it is lazy.if it eat a little that means it is sick
Depending on what your sick goldfish has, it will either be specific to that fish, which you should place in a separate tank to treat, or it's something that will spread to other fish in your tank, in which case you will need to treat them all.
who knows. maybe it's sick.
No. Goldfish in fact are basically the fish that will get sick the SLOWEST because they are extremely hardy and have almost no requirements other than food and water.
when your goldfish gets sick you can either take it to a person who nose how to handle with fish or you can just leave it and let it dye because i"m just saying that it is part of there life.
Usually when they are about 2-3 years old. Goldfish can also die if you don't feed them enough, or too much. When goldfish are not kept in a clean habitat, they can get sick and die. Make sure to clean your goldfish tank at least once a week. Remember, goldfish mainly die from aging
for only he goldfish or fish know that