sometimes you can tell if they are very slow at swimming. If they dont eat anything that can be a sign.
Before I tell on a goldfish, I try to work the problem out with the goldfish. If I cannot work out the problem, I generally tell the goldfish's Mother or Father in person.
It is probably sick
they might get the "ICK" or they can get sick from there bowl or tank not being clean
Obviously they can get sick just like any other creature.
There is no difference
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.
Humans cry. Goldfish do not have the capability to do so.