They do this sometimes and are simply stretching, but the usual reason is to make themselves look bigger to either a female in a mating display or when done towards another male it is as a threat or warning to move on.
When it sees another beta fish it gets territorial and wants to fight it, not even realizing that it's looking at itself.
you can tell if its a boy or girl by the fins the male Betta has long fins and the female Betta has small fins
A female betta has very small fins with a long body while the male betta have lots of nice flowing fins.
Male betta's are larger, more colorful, and have much longer fins. Female betta's are small, less colorful, and have short stubby fins.
It probably means that your female (girl) Betta is a male that has not yet fully matured.
usually a male has longer tail fins but they are about the same for side fins
Male betas are colorful and have large fins. Females have virtually no fins and have no color
Your betta fish is a female if she has smaller fins than an average male.
My Betta has swelling under it's front fins below it's gills.
A Crowntail Betta Splendens is a variant of Splendens that has parted fins in a way that makes them look appealing. it is simply something you must look up on google images to get the right answer Fightn' Fact: There isn't only one Betta. Betta is an entire Genus of fish that qualify for certain specimens of fish. The fish you are talking about is betta splendens
Yes; fish fins can regrow and heal with amazing speed.
when they get frightened or scared. sometimes when their annoyed