I would try and find another South Amaerican Cichlid that is bigger than he is and could hold his own if I was going to put another fish in there. Although the Oscar will get up to 10 inches and I don't really know if I would put anything else in there especially with only a 55 gallon tank. I have heard that you need to keep Oscars in groups of 8-12 to keep there aggression down just like most other cichlids. That is my opinion, maybe it helped and good luck.
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55 Gallon
...1 Pleco
...4 Sunshine Peacocks
...1 Altolamprologus Calvus
...1 Cyrtocara Moorii (Blue Dolphin)
...1 Julidochromis Marlieri Burundi
...1 Neolamprologus brichardi
...1 Yellow Lab
...1 Sciaenochromis fryeri (Chewere)
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