I have no trouble at all with my Jericho in a community tank, with danios, female guppies and gouramis, (as well as snails, adfs and ghost shrimp). The only time he pays any attention to anyone else is when they fight. Then he swims between them. I also have a small mirror that hangs on the side of the tank. It has been there for several months. He will swim by and flare as he goes by and then goes on about his business.
If you have him in the tank with the neon tetras, just keep an eye on them. They can be pretty bad fin nippers. Jericho was pretty torn up when I got him from being in with neon tetras.