Yes, until one male kills the other or the pacus eat them both.
Neons
They are not scared. They attack the reflection in the mirror. Male betas are aggressive toward other male betas, so when they see there reflection, they flare up and try to attack the "other fish."
The males fight for the female. Not usually with the female. In general, the male will harass the female to breed, but not fight with it.
Male Pacus tend to have a more obvious red belly than females. Some also say the males gave a more "pointed" dorsal fin, but I have a male and female and their dorsal fins don't seem to look any different. Hope that helps!
2 male Bettas can not be kept together. Crowntails are the same species (Betta splendens) the only difference is in the tail shape.
because they are just like people dating they fight
If you put 2 f. bellied toads together in the spring and summer, the male will bark and the female will respond by having sex w/ the male.
Only long enough to breed. Once they have spawned, the male will chase the female from the nest. If she cannot retreat far enough (at least 30 gallon tank), he will kill her.
Male betas are colorful and have large fins. Females have virtually no fins and have no color
usally femal betas will lay eggs and they`re smarter!!
males have longer tails
I am no expert, but believe that betas are solitary and prefer to have a fish bowl to themselves.