They're omnivores, so it's good to have plant matter in the diet as well. Prepared flakes and Spirulina flakes are both good staples, the latter for the veggie part. Blood worms and Mysis shrimp are good supplements. Beefheart is not good for any fish, including Oscars. Breeders use it to make the fish grow fast for quick sale and unfortunately aquarists have taken this as a sign that it's ok, but the fatty, meaty protien of it is best avoided.
