Gud luck to you. I doubt you can supply enough for your oscar. I had oscar very long long time ago. Come to think of it was like 18 years back. 1 of my first fishes. My advise is to have a 2 feet x 4 feet x 1 feet (depth) pond. Throw 3 bags of the feeder guppies into it then you can harvest after 1 month. Don't think you can do that with fancy guppies (the colorful ones). Anyway oscar's true beauty can only be amplified by feeding shrimps. I had very beautiful oscars then. Only fed them with shrimps.