Clownfish lethargic and not eating, with no visible issues

[Andreas' Reef]

Hey, recently my clownfish has been acting lethargic. About 3 days after I noticed this, the clownfish had stopped eating. I haven’t seen it eat for 2 days. It is kinda sitting in the bottom corner of the tank. It isn’t touching the sand bed though. It actively refuses food right in front of its face. All the other fish are fine, even its clownfish partner. There’s No aggression towards it. It’s the biggest and toughest fish in the tank. Is there something I’m missing? Here’s some pictures.

 

[Andreas' Reef]

Bump