My new arowana got his pectoral and pelvic fins ripped by a oscar ,, please everyoe help me on how to treat him,, is he going to die

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i feel so bad
Take it as learning experience. Everybody here has lost a fish before, heck, I lost a few very expensive fish that my wallet still hates me for, thebiggerthebetter thebiggerthebetter has lots tons of fish, it’s a part of our hobby, with each death comes knowledge and we grow as a person and as a fish keeper and we strive to do better next time to prevent the thing that costed our fish their life again.
 
I got him for my bday 3 days ago ???????
Sorry for your loss. As stated i think due to the oscars aggression the arowana banged itself against the glass causing it to have a swim bladder injury and damaged fins. The swim bladder injury caused its death, not the damaged pectoral fin
 
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My sympathies.

In order to learn from this, you have to analyze why the fish perished and do not repeat the same error.

I don't see any obvious or bad damage to the fins you are describing. I don't think it was the direct cause of death. The stress of being harassed by a tank mate could have been it. If it was 3 days of continuous or regular harassment, that plus the stress of transport and acclimation to a new tank could have pushed your arowana over the edge. Stress is one of the top killers, if not the top killer of fish in our hobby.

If it was a blow to the head, which often happens when arowana try to jump to escape a stressful situation, you'd see obvious bang mark and bruised mouth and hear area. If you don't see it, it was most likely just stress.
 
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