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i agree ... pellets are really nice but some fish won't take them. If this happens to your oscars (very unlikely) just don't feed them for 3 or 4 days. that should get them more into eating the pellets. If not put some flakes in.
try to stay away from feeding your oscar human food. they are usually hard for the fish to digest, however they do appreciate a small earthworm or even feeder goldfish. the oscars are fun to watch as they chase the little fish.