I have a pond with 4 large Koi (about 9-10lbs each) and 6 Comets. I went to the pond store and wanted to buy one more fish. I saw a fish I liked called an Oranda and spoke to a worker at the pond store. I explained to her what kind of fish I already had in the pond, the size of the pond (fairly large) and if the Oranda would work well with what I already had. She assured me the Oranda would be great. When I got the Oranda home and after I aclimated the bag to the pond and finally released him I knew he immediately hated the environment. One comet immediately started bothering him by chasing him around. I thought maybe the pestering would stop but evidently it didnt. This morning when I went to feed the fish I could not find him, dead or alive. When I researched it this morning I saw that goldfish may pick on the Oranda's and the Oranda's may have trouble getting food while competing with the quicker goldfish. I wish I didnt take the worker at the pond stores advice and did my own research prior to buying the Oranda. I wasted 60 bucks on a fish but worse off hes probably dead. The only hope is I didnt see him swimming, floating or sunk so maybe he was hiding in a good spot under a rock or something. Would the other fish actually eat him? The Koi and Comets? I hope hes still alive and the other fish learn to accept him...What other fish would work well with Koi and Comets? I would like to get a hardy cool fish that will work well with what I have and also live through the harsh north Jersey winters...thanks in advance