Okay, so back to the petco thing. I'm an employee, and we're technically not allowed to take the fish. Because MOST stores do not have quarantine systems. IF they do, the fish goes under quarantine for 72 hours, and the fish should not have been sold for that much money. They should have been sent out for a small adoption fee. I'd try taking them to a TRUSTED LFS, someone you know who will be responsible, and make the right choice in re-homing the fish to an appropriate sized tank. (I know some LFS' in my area that will send a three inch Oscar out to a ten gallon tank)