[PPhommahaxay]

I had a pair of clownfish i bought awhile ago, they were the same size. One jumped out and one was left in the tank alone for 2 months. I felt it was lonely so, I got a black ocellaris clown which i thought it was smaller but instead it was 1.5 times bigger. they were doing well for a month until the black ocellaris clown started to chase the orange ocellaris. Now i noticed that this had been getting much worse . The black clown would chase and nip at the tail of the orange even in feeding. The orange clown backs out when the black clown gets close. Now the orange one hides in a little gap between the rocks to get away from the black clown.

What should I do? do i trade in my black ocellaris clown for a smaller one? or will this stop later on?

Please Help.