Dominant Silver Moony?!?!

Reefkeeper8774

New member
It's been a week since I bought some silver moonys and the first 3 days I quarantined them. They seemed very healthy so the 4rth day, I let them in my main display tank. They were all doing great until today, I noticed that the biggest silver moony started being aggresive towards the other moonys. Can anyone explain this? Don't they normally live as a group instead of a dominant who chases the others away?
Tank: 70g
Fish: Bird Wrasse, Yellow Tang, Blue Tang, Two Clownfish, Cleaner Wrasse, Sailor Tang and 4 silver moonys
 
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