Clownfish attacking tank mate HELP

[Juster]

I initially put two clownfish in my tank. Things were fine for several months. Then the lager clown jumped into my overflow and stayed there for a month or so. I eventually found him and put him back in the main part of the tank a week or so ago. It seem that over the last couple of days he has become very aggressive and today when I just feed them him didn't want to let the other clown eat and was nipping at his fins. What should I do.

Juster

 

[melosu58]

Alot of times if you have aggression cut the lights out for a while.

 

[demodiki]

What type of clowns? Are they the same type? Maybe rearrange the rocks.