Red wolves seem to be very different from fish to fish; some seem very mellow and community-friendly with non-edible tankmates; others, like mine, are extremely aggressive and simply will not tolerate company. Does this relate to how they are raised as youngsters? I don't know; all I can say is that mine launches himself with murderous intent at fish bigger than himself while they float in glass containers in his tank. He was alone for the first couple months of his life, apparently accepted a single tankmate at that point, but a few days later the newbie (a catfish) had to be removed to save its life. A second attempt, with a much bigger fish, was aborted before it was even released. YMMV.
