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.
some times it takes about 18 to 20 weeks if you have a fintail the fintail will have eggs up to 123 eggs.
Goldfish are not particularly attracted to any one colour.
Goldfish see in color.
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.
Fintail fish, commonly known as Fintails or Fintail Goldfish, can vary in size depending on the specific species, but many can grow to be around 6 to 8 inches long. Some larger varieties may reach up to 12 inches or more under optimal care. Proper tank size and water quality can influence their growth potential, so providing a suitable environment is essential for their development.
goldfish do
she is probably pregnant.
the lack of light being in the dark
Yes!
It is common for young goldfish to have dark makings that eventually disappear as the fish grow/mature.
from eBay write goldfish alive and you will see them but they are no that excpensive :)
Yes of course. Otherwise, how would they breed?