I've gotten ahold of a pair of really red oscars. They've both got bottomless pits for stomachs. They are about 3in in length. I would like to add other fish to this setup as they grow and get older. What other fish would make good tankmates for this set of oscars??? I know another oscar would but what other cichlids, oddballs, coldwater fish would make good tankmates for them. Yes they are kept at coldwater temps. But oddly enough our local fish stores all keep and raise the fish they sell in cold water. So a coldwater or tropical fish mixture won't be a problem. If you need to know tank size, lets say for a 150gallon tank. Would a 8in common goldfish be a good tankmate???? I know what i'm diving into so don't worry. Hey if i can provide for a 2 yr old goldfish that's already 8in..........i can provide for these oscars. Thanks.