Bandit angel stop eating after treatment

[Achilles Torben]

Hello guys. A few weeks ago I bought a large bandit angel. Apolemichthys arcuatus. He start eating directly and so I have no issues with him. The Bandit go to quarantine tank together with two tiny Centropyge interrupta. One interrupta had problems with white extrement. So I decided to treat against intestinal flagellates. A few days later Bandit stop eating. Tiny interrupta and tiny Pygoplites are fine. Can you give me advise?

 

[GoldeneyeRet]

How did you treat? I cant make out the attachment.

 

[Achilles Torben]

How did you treat? I cant make out the attachment.

You can't open or it is to small?

I use Hexamor of Aquarium Münster

 

[GoldeneyeRet]

Too small. Old eyes, old phone lol