injury

[shern]

greetings all, came down today to see this on my flagtail, he’s the only fish that gets chased at in the 250 and it’s by a ntt dat, i’ve never seen any actual attack just some chasing. the other inhabitants are extremely peaceful and highly doubt it’s them, could he have scratched himself in the wood? why is the injury a bit brown and is there anything i should do?

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[shern]

i also recently noticed some fin tearing on the flagtail

 

[Deadeye]

The head looks like a scrape from hitting something too hard, but usually they only do that if they are running (or swimming) from something.
Rips in fins are a classic sign of aggression.