Sunflower seed has quite a fat content, and should be fed sparingly to all parrots, no matter the species. I feel it is important to give parakeets the small seeds ratther than the larger seeds in a cockatiel mix. My suggestion would be to remove the seed cup in the cockatiel's cage, while the parakeet is visiting that cage. Larger seeds, in my view, are difficult for a parakeet\budgie to digest.
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