It will turn white, or at least will start having some loss of color.
Yes!
They will be left in the dark...
Goldfish are not particularly attracted to any one colour.
A goldfish left in the dark would gradually, over time, turn completely white. This is because the color pigmentation cells responsible for the fish's bright color, cannot work without sunlight. It would, however, take a very long time for a goldfish to lose 100% of its color because they have so many color pigmentation cells in their scales.
when a goldfish puffs it puffs out what it was chewing on
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.
goldfish do
If a goldfish is kept in the dark it will appear lighter in the morning, So if left in the dark for a long period of time, a goldfish will turn almost white. If kept in the light, it will absorb color, and often become a brighter gold. (almost the same as when we tan, the sun gives us color, and when we get less of it we turn whiter, or lighter)
she is probably pregnant.
I think you mean "Fantail" and the answer is goldfish can see no better or worse in the dark than most other fish. They are normal in their light requirements.
nothing
Its DEAD