Take a look at the first link below it will help take you through the process and help you with what Cecil and Bruce are saying. Then look at the second link which is the archive to sick fish.

Dying BG

http://www.pondboss.com/cgi-bin/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=7;t=000311;p=1

From this Archive thread

http://www.pondboss.com/cgi-bin/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=22;t=000002