Long nose butterfly not swimming

[Mikef307]

Hello I could really use some help. I purchased a butterfly fish about 2 weeks ago and up until now he has been doing just fine. Almost always out swimming, eating algae from the rocks, he would pick at the missus shrimp when fed. Didn't seem to eat a ton of them though. I went to feed the tank today and he fell to the bottom of the tank and stopped swimming. He is still breathing just not moving.

 

[Mikef307]