Neon Tetra Behaviour

LellowFish

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I orginally had 4 Neons in my tank, but the weather became warmer so I bought 5 more. Now, everything was going fine, orginals checking out the newbies then not bothering and vice verca. Until I released the newbies. A couple of hours later I noticed that they all seemed to be fighting within themselves. Now, I'm not sure if it was everyone against everyone or one picking on everyone else but I just wondered if this was normal after adding new fish?

Are they just re-sorting the pecking order?
 

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