it my not your
Perhaps you mean 'Clamped fin'. Clamped fin is caused either by parasites or poor water quality. If you mean 'Fantail'. A fantail is a fish with 2 tails instead of one. They are harder to keep than goldfish but are much prettier
You get down and look really close and if you see something floating and colored pick it up and its most likely a fin
I would name my black goldfish Fin
Yes, but normally they grow back slowly. However, if fin rot has reached the base of the fin, then the goldfish would be in pain the rest of its life.
yes
yes, but it may kill the goldfish
A goldfish has about 1,500 bones inside of it.
Because there is no hard or tough tissue inside of the fin to keep a erect shape.
Caudal fin
Use a medicine called Mr. Yellow found in medical stores and pet shops. This cures fin rot.
That's probably its poo, that's what my goldfish did. Their waste has to come out somewhere. maybe finrot. may be not nvm
There is very little you can do if the fish is floating. The fishes swim bladder is damaged so the fish will never recover. May I recommend that you do not mix coldwater fish (Goldfish) with tropicals (Rainbow shark) they need totally different conditions so you are bound for disappointment one way or another anyway.