whats up with my oscar?

  • We are currently upgrading MFK. thanks! -neo
Looks stressed, is that a scar On his lower lip?
 
Yeah the lip injury looks like he was fighting with another fish. And the coloration is definitely stress coloring.

I'd bet he got in a fight and lost, and now is trying to just stay out of the way. You might want to separate the fish.
 
Try changing around all the decorations and stuff in the tank then do a big water change
 
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