Are they paired?

[Zagecko]

I have 2 clownfish in my tank not sure what kind, I just got one yesterday and the other one has been here a while, maybe 3-4 months. He is 1inch long and the new one is like 3inches.
At first they were twitching and fighting for a few minutes. Then they stopped. But kept twitching at each other. They share the same territory and sleeping spot.

 

[Cambrian Reef]

sounds like normal behavior between a male and a female clown to me.

 

[Zagecko]

The big one is at the back and the small one is in the front so they look the same size.

 

[One Reefing Boi]

they are just clowning around.....

I'll leave now...

but if you just got a new one they are just establishing roles and hierarchy. Not sure if they would pair THAT quickly but I have no clue.