change in clown fish behavior

[tmwoods]

I have 2 clown fish that I placed in my tank together about 7 months ago. They have been doin great along with the rest of the tank however in the past 2 weeks one of the clown fish is really aggressive towards the other one and chases it all over the tank and I feel like the other one is slowly getting stressed. Any body have any reasons for this sudden behavior?:hmm2:

 

[bues0022]

They are attempting to establish the dominant and submissive role in the tank. Seems pretty normal. If the submissive one becomes excessively stressed and looks like death is likely, put it in a breeder net to isolate.