I know what oscars are compatible with, but I have done quite a bit of research and all I can find is the black ghost is good with any other very large community fish. I have the tank size to house 1 of each specimen. I have a 100 gallon and each fish only gets to 1 foot. I know that oscars leave most fish alone that live on different levels of the tank. An oscar is a middle dwelling fish so it leaves plecos, and other bottom fish, and most top dwelling fish. Thanks!