I've never heard anyone on any of the forums I visit mention their goldfish eating worms. Mine(who started out as a feeder fish for my African clawed frogs but lived and has gotten huge!)acts absolutely mad at me if he doesn't get at least one worm a day! Being in my frog tank, he got used to, from the beginning, fighting with my frogs over the worms. He is at the top of the tank taking these from my hand looking at me with those sad eyes wanting more! My husband of course tells me that he's just a little carp anyway so why not? LOL!