I agree with ashleigh
betta behavior
Warriors by nature. The Betta Splendens (splendid warrior), is, as his name indicates, a warrior. Basically, he is a fish with a bad attitude problem
)). The thing is bettas are only pissed off at other bettas, while quite gentle with other specie, which makes them good community tank prospects. They do get picked on a lot by other fish, so avoid putting a betta in a tank with fish that are aggressive, especially fin nippers such as tiger barbs, etc…
Flaring and displaying. When a male betta (and sometimes a female) sees another male, his first reaction is one of intimidation. The betta will immediately stretch out his fins as much as he can and open his gills as wide as he can, displaying his membrane, and suddenly looking twice a big as he really is
. This is called FLARING or DISPLAYING. He’s doing the macho thing, sorta like “I am bigger than you , watch out, I can kick your butt!”. He will repeatedly do this and if the other betta has the same bad attitude, they will soon start attacking each other. (so never put two bettas together!! Duh!) Their color intensifies and they look just gorgeous. .
above: a betta at rest (left) may not look very threatning. The same betta flaring (right) appears to be twice as large, hence intimidating rivals. Over activity may cause the tail to tear, especially in halfmoon bettas, a phenomena known as "blowing a tail". Notice slight tears in the above halfmoon betta's tail.
Because bettas are not as intelligent than us (or are they?
) ) you can get the same result by putting a mirror in front of them. Well, it’s not really that they are dumb, but they don’t know what they look like, so when they see the betta in the mirror, they don’t know the betta is actually THEM.
This makes for hours of fun watching the whole commotion. And no, bettas will not get exhausted, as a matter of fact, I have two brothers jarred side by side who have been continually flaring at each other for a year now. I believe that a little action and company is good for the moral. So I let my bettas see each other. This is not a good idea though, if you intend to show your bettas. Sometimes, a betta who looks lethargic will be stimulated by replacing his neighbor. A new neighbor equals a new pecking order to establish and a whole new desire for flaring.
I found this on Betta talk.com