Truly bizarre tang aggression

gillskills

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Tonight I ran into, without question, one of the strangest things I ever have in all my days keeping fish.
I recently finished adding my fish back to the DT after a long fallow period for ich. They’ve been back about two weeks, and tonight I cut the lights off a little early to acclimate a new arrival. No sooner did the lights cut out, than my two spot bristletooth tang started savagely chasing, biting, and swiping his scalpel at my melanarus wrasse of all things!

the tank is a 90 long, And other tank mates include a maroon clown, potters angel, and black cap jawfish (there is a 5” sand bed). The tang was the last fish to be added back to the DT, and I tweaked my rock work while it was fallow.

the wrasse finally dive for the sand bed to escape the tangs fury, although he’s still only half buried in the corner of the tank where tang had him trapped. I put my flashlight on the tang for now to keep him hidden in his cave... what now?
I’m very confused at the situation given the tang was peaceful with lights on, is in a tank that can accommodate its full grown size (is only 4” now), and isn’t competing with any other tangs. If anything, I’d have thought he’d target the angel. Any thoughts?
 
It just doesn't like it.

My small 3" tomini tang and my potter's angel hate my sand sifting goby (so do I), so they'll chase him around when they want to. Sometimes you just can't explain it.
 
My bristletooth tang started doing this to my tricolor fairy wrasse also but only at night when the lights are off what is the meaning of this?!?!
 

HOW MUCH DOES A FISH’S FEEDING REQUIREMENTS AFFECT YOUR STOCKING DECISIONS?

  • A lot! - I avoid fish that require frequent or specialized feeding

    Votes: 9 25.0%
  • Quite a bit, but an automatic feeder can change my answer

    Votes: 6 16.7%
  • It depends on whether my nutrient export can handle it

    Votes: 5 13.9%
  • It depends on how badly I want the fish

    Votes: 10 27.8%
  • Not much. I’m willing to adjust my routine

    Votes: 9 25.0%
  • Not at all. Feeding demands don’t limit my stocking choices

    Votes: 6 16.7%
  • I usually learn about the demanding feeding schedule after buying the fish!

    Votes: 2 5.6%
  • I haven’t really considered this before

    Votes: 3 8.3%
  • Something else (see my comments in the thread)

    Votes: 1 2.8%
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