Yellow tang being picked on, need help identifying culprit!

[saltypuffer]

Yesterday I noticed a sizable bite shaped chunk missing from my yellow tangs top fin, today I noticed a second identical chunk missing. That prompted me to jump into action to remove the culprit. Just a few days ago I added a Blue Jaw Trigger and a large oscellaris clown. I have moved my blue jaw trigger to the sump until I figure out exactly what’s going on, but I wanted your guys input first. Is it likely my trigger, or one of my other longer time residents? Here are the tank members:

Yellow tang
Blue tang
Naso tang
Oscellaris clown
Clarkii clown
Red hawk fish
Yellow tail damsel
Foxface rabbitfish
2 blue green chromis (relatively new)
Blue jaw trigger

Please help me solve this mystery so I can remove the culprit from my tank asap, I love my yellow tang and wouldn’t want anymore damage to take place.

 

[*GAREEF*]

Yesterday I noticed a sizable bite shaped chunk missing from my yellow tangs top fin, today I noticed a second identical chunk missing. That prompted me to jump into action to remove the culprit. Just a few days ago I added a Blue Jaw Trigger and a large oscellaris clown. I have moved my blue jaw trigger to the sump until I figure out exactly what’s going on, but I wanted your guys input first. Is it likely my trigger, or one of my other longer time residents? Here are the tank members:

Yellow tang
Blue tang
Naso tang
Oscellaris clown
Clarkii clown
Red hawk fish
Yellow tail damsel
Foxface rabbitfish
2 blue green chromis (relatively new)
Blue jaw trigger

Please help me solve this mystery so I can remove the culprit from my tank asap, I love my yellow tang and wouldn’t want anymore damage to take place.

What size of aquarium are they in and can you post a picture of your display?

 

[i cant think]

Yesterday I noticed a sizable bite shaped chunk missing from my yellow tangs top fin, today I noticed a second identical chunk missing. That prompted me to jump into action to remove the culprit. Just a few days ago I added a Blue Jaw Trigger and a large oscellaris clown. I have moved my blue jaw trigger to the sump until I figure out exactly what’s going on, but I wanted your guys input first. Is it likely my trigger, or one of my other longer time residents? Here are the tank members:

Yellow tang
Blue tang
Naso tang
Oscellaris clown
Clarkii clown
Red hawk fish
Yellow tail damsel
Foxface rabbitfish
2 blue green chromis (relatively new)
Blue jaw trigger

Please help me solve this mystery so I can remove the culprit from my tank asap, I love my yellow tang and wouldn’t want anymore damage to take place.

My bet is on the Clarkii clown or Trigger, both can be quite boisterous and take chunks out of other fish if they enter their territory.