Anyone know why my clownfish keep going at each other?

[GeorgeTinck]

Been in the same tank for around 7 months and showed all sorts of mating and pre spawning behaviours although there was never any eggs laid that I noticed.

Recent month or so there has been a lot more aggression

 

[nautical_nathaniel]

Unfortunately, because they're about the same size, they're gonna do this for a little while to establish dominance. I imagine the more orange one will win in the long run since it is a little bigger.