Sometimes it could just be the new fishes are not familiar with eating floating flake food (usually they are fed with tubifex at most LFS), so just continue feeding very small portions at a time and let them get used to looking for food at the water surface. Remove any uneaten food after 2-3 minutes and try again a while later.
Also check that the flake food is not expired, and make sure its container or packet is airtight, if exposed to air for too long, the food can also very quickly become stale too.
Swordtails and platys eat pretty much any commercial fish food... i've fed my own swordtails Hikari micro pellets and wafers, they even snap up shrimp pellets and algae wafers too.![]()
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