I have a 65gal angled front tank that has been working as a community tank for about 6 months about 2 months ago i added a brown African knife fish to the works and about 2 weeks ago I added 2 tinfoil barbs and a Banded Leporinus well it seems like the Leporinus and the Knife fish(whom i have named Khan....seemed appropriate name for him ) seem to be haveing some scuffles the knife fish has a few sores on his right side there are 3 logs in the tank and a good bit of vegetation i am not sure what to do i don't want the Leporinus to kill the knife fish he is one of the few i have ever seen come out but I don't want khan to kill the Leporinus he was exceptionally hard to find. Any ideas on what to do to the tank to minimize the fighting?