I have had zero issues wiith them getting along with Leopard Bush Fish, Otto's, Cardinal Tetras, Boesemani Rainbows, Roseline Sharks, Plecos, Clown Loaches, Ember Tetras, African Dwarf Frogs, and ropefish.
I have read that they will not tolerate any other rainbow, red-tail or black shark though.
They will also get territorial as they mature and will claim an area, usually like a cave or other hiding place. I have seen him claim stuff in my tank, although it is planted along with a lot of driftwood, so everyone seems to have their own place. No issues so far.