Well, I finally got a peek and some pics of the goldfish. It definitely
looks like something that he ate disagreed with him. From the inside
out, a la the movie Alien. Be warned, if you're eating or have a
squeamish tummy, don't look.

Pic 1, http://www.flickr.com/photos/95599065@N00/27127863/
Pic 2, somewhat humorous,
http://www.flickr.com/photos/95599065@N00/27127864/

I'm definitely thinking dragonfly larvae. Anybody else?

Lilly