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If it is a fantail betta, the boy will have very large, flowing fins. If it is a girl, the fins will be short and not very fancy.
fantail
Fantail fish usually have four mates.
Lord Howe Fantail was created in 1879.
Fantail goldfish are black, white, gold or a mix of all three (also known as calico fantails).
I used to have a gold fantail and a white fantail which lived for about 5 years but ive heard they can live longer.