Your fish has a swim bladder problem. There is no known effective cure. The fish will die eventually. I would advise 'euthanasia'.
Yes.
I am sure the meaning is quite literal. They are goldfish that eat other goldfish.
Other goldfish, preferably This will ensure that the goldfish will not be injured by other tankmates and also ensures that the other tankmate's gills are not damaged by the large amounts of toxic wastes (ammonia) that the goldfish produces daily.
Goldfish jump out of the water for a variety of different reasons. Some gold fish need more oxygen than what is in their water for example.
yes
It's not uncommon for goldfish to hang around each other in a tank; sometimes they don't bother with each other, and other times they are bumping into each other.
No. A goldfish can only breed with other Carassiusspecies.
No
Get a second goldfish.
Shubunkins are goldfish, so therefore mixing goldfish with goldfish is usually not a problem. However, if the other goldfish are fancy then mixing them together would not be recommended.
Goldfish to not kiss each other. They may play, or bump into each other, but they do not kiss.
That usually means your goldfish will be floating belly up in a few days. Once you see lesions, the ich (see link) has all but taken over the fish's body. You might want to treat the water with bromothymol blue (pet store will have it) if you have other fish in the same tank.