What's wrong? What to do with clown?

[Delphinus]

I don't know what to suggest. I wish it were under happier circumstances that I say "Welcome to Canreef."

I don't know about fish diseases. At the point that it sounds like she is at though, I don't hold out a lot of optimism that she will recover on her own. I would think a hospital tank treatment is called for. If you have a 10g tank fill it up with some tank water and be doing water changes on it daily (with water from the main tank).

I hope that someone else can jump in here and offer some more advice too. Good luck.