Two things for certain - eat & make messes
Well goldfish move their fins of course.
Absolutely not. Goldfish belong with goldfish, and not with a bichir in any way.
Well my goldfish cost 75 ponds some other goldfish cost 67 pounds it matters how big they are
Fantail goldfish are a hardy breed, strong swimmers and they compete well for food with the ryukin, shubunkin, comet or common goldfish; making these goldfish breeds good tank mates for your fantail goldfish.
Well sometimes they can like love each other and have eggs. Sometimes they fight because they never want to be friends and they fight over goldfish food to.Or if they get along well they could be mates. And when a male goldfish bites the female well my one died.
well it just depends how old it is
Well yes you need a male goldfish and a female goldfish to have babies but it takes allot of time to breed them.
any
None, goldfish should only be housed with other goldfish.
Well, they have to be mature also, which is about a few years of age.
Think about this for a minute.. goldfish do not appear out of no where and they aren't artificially created. How else do they appear? Well they breed to produce eggs where goldfish fry (babies) come from.
Well, i really dnt know