Some people choose to flush them down the toilet. Other people choose to barry them in their yard. If your fish has just died recently, and you are worried about the others getting sick and dieing too, before disposing the fish you may want to send it to a lab or piscine vet for an autopsy.
it stops swimming
oh yes, definitly!
if the goldfish's mouth couldn't open then it wouldn't be able to eat and it would end up dying.
Give it more fresh water feed it or it is so darn sick it just dies .......goodluck.
It's most likely already dead.
My best suggestion is to go to a fish store and supply them with the information about your sick goldfish. They might pinpoint the sickness and offer you some medication for your fish.
Don't take a goldfish out of water.
You should not feed goldfish soup.
I am not very sure but my guess is Yes. But I do know if it is floating upside down it is very dead. Hope the Goldfish does not die
Normally goldfish are peaceful and calm.But incase your goldfish is doing so then its better to separate the new goldfish.
When their swimming upside down its usually a sign that their dying
Yes. It should be fine. I have 2 regular goldfish living with a bubble eye goldfish and to fancy fantail goldfish, so I think it will be okay.