Just keep your nitrates low and keep clean water. I would feed very meaty food and lots of healthy live foods. Keep an eye on it and see what happens. There are also articles on here about Oscars including mine...
http://www.aquariacentral.com/forums/showthread.php?t=155606 As far as live foods, earthworms, mealworms, beefheart, crickets, brine shrimp are all good live/meaty food you can feed your Oscar.
