Live food newbie question

[ScubaPoodle]

Having recently started a 5gal freshwater aquarium, I have been wondering what disease-free live food I can feed my fish after the tank has finished cycling. I have considered daphnia as a possible option, but I have not found any daphnia culture kits at my local pet store. Does anyone know if there are any alternatives daphnia, or if there is anyway to culture daphnia without a kit?

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