Are my clownfish a pair?

[yuzu]

I have 2 clownfish, one slightly bigger than the other, both around 5cm, and I've had them 5 months. They get along well, the smaller mostly ignoring everyone and the bigger following/guarding the smaller one. The bigger is fairly aggressive to my 2 chromis (the only other fish in the tank) when they get near and chases them a few cm; they seem unphased by this and come back for more. The bigger one is not aggressive to the smaller one and occasionally shivers to it, with the other one shivering too. They seem to swim around together most of the time, especially at night. Is it likely they will remain peaceful as they grow up or can their relationship change?

 

[Perthegallon]

yes

 

[vetteguy53081]

Very good possibility. They will also clean the area they are gguarding and shake and shimmy a little.. . . All signs