Wrasse aggression

[bauder1986]

So to quote a few people that like to mix semi aggressive to their own family of fish. Watch closely for a few weeks. They could be simply re-establishing the pecking order. But watch for any of them getting injured or possibly too stressed that they get sick. If that happens, quarantine the injured/sick fish and nurse back to health. While they are in quarantine watch the others to make sure they don't pick a new weak link. If they do and it's the same bullies then entertain the idea of trading those bullies out. If it's not the same bullies then it's just a pecking order thing. Continue monitoring. Re-introduce the quarantined fish when it's ready. Keep watching until pecking order is established.