Not a goldfish anymore.
Goldfish of any type are all egg laying fish which means that they do not get pregnant
You could go by the golden rule. If to all intents and purposes it looks and behaves like a goldfish, in all probability it is a goldfish. Goldfish come in very many different shapes, sizes and colours.
"Goldfish" colors range from white to yellow-orange to blue to black. White goldfish have no pigment cells.
no
Very dark, all the time, but truthfully it isn't healthy for the goldfish to be subjected to such conditions and it is just plain cruel to force a goldfish to stay in a dark room all the time.
usually not but it depends on the type of goldfish
A fantail goldfish can be any of the goldfish colours which can include any or all of the following white, gold, silver, copper, blue, orange etc etc.
There is no correct name. They are all goldfish. Whatever "Fancy Name" you wish to give it is up to you.
That is actually Excriment. It is him using the toilet.
no
take it out