I hear they like cucumber, but mine just eats the same stuff as all the other fish--flakes, dried shrimp, and he seems to enjoy the algae wafers as well. And occasional frozen food.
Maybe try some brine shrimp or blood worms. As for foods readily available at home - I'm drawing a blank. Good luck. Those were my favorite fish when I was a kid. I still always stop to watch them in the lfs.
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