Put a small amount, just enough to be consumed in a few minutes, into the tank. For fries, crumble up the food if it is a flake, like TetraColor.
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Baby brine shrimp are a high protein favorite of the guppy. These tiny eggs can be hatched at home and fed as a supplement to flake fish food. They should not be fed exclusively because they are mostly protein and do not contain other required nutrients. The same article says baby brine shrimp eggs are available in most aquarium supply stores.
Another popular guppy food are white worms. These little worms are often found under stones and in decaying plant matter along the Atlantic coast. Various species of white worms are also commercially bred in refrigerated units that maintain a temperature between 45 and 50 degrees Fahrenheit. The same article recommends keeping white worms alive with a diet of cracker crumbs, bread crumbs, or powdered milk.
Guppies will eat a variety of things, including flakes, bloodworm (frozen or fresh), brine shrimp and baby brine shrimp and their fry.
Good pet shops should have Livebearer food/Flakes in stock. Failing that they will have a general purpose tropical fish flake food like Tetramin. Most of these are OK for guppies.