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I just got him not long ago and put him in an established divided tank where I have another existing betta. The new one seems really restless but my other betta doesn't seem to care much. Water parameter is good as the existing betta has been living in the tank healthily and active.

As soon as I noticed some fin nipping on the new one, I took him out and housed him temporarily in a smaller container for about a week thinking he might be stressed out with another betta there. However, he still nips when he's separated. He seems to be the more aggressive kind as he will flare at my finger and jump for food. Can he be venting out his pent up aggression on himself? He was a beautiful halfmoon koi betta and now he's a mess. How can I ever stop him from nipping? I saw some new growth but he will mess it up again after a while.
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