New clown flashing - disease or aggression?

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MNscoe

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Newbie here. Bought 2 small clowns and a Tang from LFS, put in 29gal QT a week ago (were in copper so I’m continuing copper). Clowns came from new batch of about 12 at LFS.

Slightly smaller one always swims with dorsal up (see pic) and is spasming/flashing occasionally (video clip). Freshwater buddy says may be aggression/defense, not disease. I have no clue.

What do you experienced folks think?
Do I need to do anything?



IMG_1821.jpeg
 

WHAT KIND OF SUBSTRATE ARE YOU RUNNING ON YOUR TANK?

  • Bare bottom

    Votes: 2 28.6%
  • A shallow bed of fine sand

    Votes: 2 28.6%
  • A shallow bed of coarser sand

    Votes: 1 14.3%
  • A deep sand bed

    Votes: 1 14.3%
  • Mixed substrate or varying sand depth

    Votes: 1 14.3%
  • Some other substrate (posted in the comments)

    Votes: 0 0.0%
  • I don’t have a reef tank yet

    Votes: 0 0.0%
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