Originally Posted by Mirage23
I have two male bettas in a 10 gallon tank separated by a divider. Today I caught them flaring at each other through the divider and then they'd show each other the side of their body. Fins spread out and lookin huge. They'd wave their bodies and then blow a bubble at the surface. One would watch the other blow a bubble and when it was done it was his turn to blow a bubble. Then they'd start over. Eventually they both quit. But that was such an interesting sight! What were they doing? Dancing at each other? Anyone else experienced this?
That is a very common male display. They are trying to look all tough and say, "Hey! Git of my turf!"
It's perfectly normal. But if it becomes constant you may want to make it so they can't see each other. Too much flaring can become stressful on them...