I have a large Oscar and a larger Black shark together and it looks like the Black shark is beating up the O pretty bad. The O's fins look torn and broken and has some damage to his scales on both sides of him. I put some aquarium salt in to help him heal and put the temp down hoping that will slow down the BS. I attached a pic of him showing the damage. He normally is very active and charges the glass if you get too close but lately he's been sluggish. What else can I do to help him heal?
Thanks for your help!

Thanks for your help!
