Flashing or Aggression

[isomorphic85]

Is this flashing or this aggression from his own reflection?
Video link below

https://www.youtube.com/watch?v=0fI9tgYFK64

 

[theMatrix]

Agression. Its trying to use its rear fin sword on the reflection.

Theres some flashing also...see the top fina flaring high up then the tail swipe.

Ive seen a Yellow tang leave a gash on a tank mate with flesh showing from that tail swipe

 

[isomorphic85]

what is the reason for flashing?

 

[Deinonych]

I don't see any flashing in that video. Looks like aggression toward the YT's reflection. My Kole goes through a similar ritual every night when the actinics come on.

 

[theMatrix]

My yt swells up every night dorsal fins are up all night. But no agression. Just wants to show the tank mates hes there. No threat no tail swipes with the blade.