Feeding Goldfish Cultured Fruit Flies Options

[Yunque Goldfish]

Hello,

Hope all you guys are well. I'm slowly getting into breeding goldfish - been touching up on my readings and all that jazz. I'm waiting to move back home (Puerto Rico) after I graduate this semester to actually start breeding. Been living in Ithaca, NY as I go to Cornell U. Gonna miss the cold. Anyways, so I've been taking care of two ranchus this semester, as my local petshop recently brought some in - someone made a special order or something like that, because they never have ranchus. I cultured fruit flies for a course and it was pretty easy! I'm wondering how viable that would be for feeding goldfish. Has anyone tried it? I know people raise black soldier larvae for aquaponic systems, but they seem a little big. I appreciate your time.