Get a mini-siphon (just a gravel washer with only a 1" bottom) and siphon uneaten food and waste from the bottom of the tank. It's normal for livebearer fry to hide in the floating plants at the surface of the water. It makes it easier for you to avoid siphoning them, unlike a lot of cichlid fry that hide on the bottom and pretend to be gravel. If you don't have a little siphon, you can use a small hose.
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