hey man i have a pair of O's myself.
i feed them a large variety of foods.
as juveniles you should feed them 3 times daily
try to shuffle their intake of foods so its not the same thing over and over. this will help their health and color.
what i feed my O's are:
Frozen Beefheart : bought at petstore, great for growth
frozen bloodworms : as above good to bring out red colors
live crickets : from juvenile O's to large you can buy small med and large crickets to suit
slivers of sea caught fish: washed and prepared for cooking
Hikari gold large cichlid pellets : good nutrients but may be hard getting a young O used to them. older ones (larger) seem to eat anything available (love these fish

)
some oscars enjoy peas, after popped out of the skin for baby O's. but this can have a laxative effect to fish lol.
avoid fatty foods as it is bad for their digestive system.
some common foods fed to oscars that are not good for them are:
Ham
Bacon
Chicken
left overs from dinner (its true i have seen it, not good fish keeping...)
hope this helps ya out dude!
post a pic of the Little monster!