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Uhhh, how big is this tank again? Oscars get big and aggressive, so I hope it's at least a 55 gallon, preferably larger if you're putting other fish in there with it... Mickey Mouse Moon sounds like a type of platy, if so they're going to be lunch for the Oscar as it grows larger...
The tiger oscar is in its own tank with my albino african clawed frog. Its a 20 gallon (just for now, I know, too small) but I will have a bigger tank up and running in a month or 2 so it'll be alright. The mickey mouse moons and the plant (brazilian sword, I think) went into the community tank