No problem at all for a short while. In the long run the tropical fish food would not have enough of the specific nutrients that make goldfish thrive, but it would take a long time ....months.... to have a problem. Strange as it may be, I have a couple goldfish now for over 5 years in a 30gal tank with guppies of all things, they live peacefully though the gf might pick off a few little guppies now and then, who knows. But I see the gf go after the Tetra tropical fish food pretty aggressively, so they like it ...just not the total balanced diet for them.
PS: I suggest the tropical fish food over breadcrumbs though breadcrumbs would be better than starving to death
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