Sadly, most PetSmarts have a 14 day or so return policy, for those fish who 'didnt make it'. This is unfortnate, because it allows people to buy several fish, take them home, and end up having them killed in a couple days, going back to PetSmart, and getting thier money back, just to do it over again.
Atleast thats the way the PetSmart here is. If it dies in the first 14 days you get your money back, which sucks for the fish, because of what i said above. A lot of peoples mindsets here are "Oh, my fish died. Ill go get another one. Oh, my fish died again, no worries, ill go get aother one. Oh, my fish died again, etc etc."
Bichirs + Oscars = No No. Smaller, less agressive cichlids, Maybe, but def not Oscars, Jags, etc.