I have a Chococlate cichlid and up until now I have mostly kept rift lake cichlids. Would an Oscar be a good tank mate long term? My chocolate is about 4 ish inches and I would like a cichlid that is close in size when grown. Chocolates are rarely seen around here so finding one of opposite sex for this one, when I don't know what it is, will be impossible. This is my first "large" fish.