


I feel Oscars are just not aggressive enough to stand up to most Central American cichlids (especially Vieja), other than the more passive Thorichthys, unless the tank is very large (300+ gals).
Because most Vieja or their kin, will see oscars as competition, and end up beaten up like what happened to yours.
I also picked up a "Synspilus" several years ago that I had no clue what species it was. It looked identical to your first picture when I got it. let me find you some pics of how it changed before I sold him.
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This guy was a real ******* he ripped the eye out of an oscar and stripped all his scales off one side. Fortunately the oscar recovered and grew into a very nice fish.
Heres the oscar a few weeks later in quarantine
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