Oscar mark.

  • We are currently upgrading MFK. thanks! -neo
looks like a scrape to me, Oscars are prone to it, they are a clumsy I do not care fish.
 
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Reactions: tlindsey
That's what I figured, I k kw they are prone to HITH but I don't think that's it? Hard to get a good picture.. he comes to me when I walk by the tank but as soon as I put my phone near the tank he hides lol
 
again looks like a scrape. keep the water pristine and he heal up fast
 
Looks like a scratch from hitting a rock. Nothing major, no need to worry. Simply just keep your water clean by doing water changes and add some kosher salt to the aquarium.
 
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