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Afraid???
Probably just feeding him fish that are too big..
My brother had an Oscar named Zeus who was ~10" long... he ate small 2" goldfish
My fiance and I have 2 Jack Dempsy's which are smaller and probably meaner than Oscars... they Love 1-2" goldfish and they are only 6" or so long....
Tell your friend to buy smaller ones, and leave them in the bag at the top of the tank for a little bit (15min or so) and it will piss them off enough so it's a frenzy when you open the bag and release the fish....
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