I have a 3000 gal outdoor pond. A few weeks ago or so had a large female goldfish die in the pond, this thread had pics of the dead fish, never knew what she died from http://www.monsterfishkeepers.com/forums/showthread.php?t=241914 . Ok well now my other big goldfish in the pond who hung out with this one all the time, has stopped eating about 4-5 days ago. He will take 1 or 2 pellets and eat it but spit it out and just not look at it anymore. He sits at top of water, on the edge under a rock/plants. He isn't gasping for air either. He use to be real active and eat. What should I do? thanks. Oh and also there are 15 or more smaller goldfish in the pond that are very active.