Join Date: Oct 2010
Location: Victoria, Australia
Since I have male wild bettas sharing a tank they will usually use stripes rather than aggression to communicate.
I have a dominant male who has the front of the tank as his territory (he is on some kind of bubble-nesting frenzy currently) and if he approaches the other two males or the female, they will immediately clamp their fins, stripe up and let him do whatever he wants.
However, one will sometimes stripe up during their brief fights and I've always wondered if it was because he knew he was going to lose or didn't really want to fight in the first place.
I find it amazing how they can just switch it on and off like that.