Trouble with black Ocellaris Pair

Can anybody answer this. I bought two small black ocellaris 3 years ago. Everything was good ti'll I split them up for a week. I added a small BC and removed one. The reason I did this the 3 yrs old were the same size, so I thought they were both females. So I was hopeing by adding small one should be pair. No good I had to remove the smaller one and added the two I had for 3 yrs. Now they fightIing so I removed one to ten gallon with the small guy. So far no fighting, One More thing when I had all 3 in same tank these two were worst of pairs. All in 34 gallon tank. Except both now in a smaller tank 10g.So far no fighting . What should I do Next.......
 
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