What foods goldfish are allowed to eat sink and not float?

i know you can give fish certain human foods such as most fruits, veggies, and whole wheat grains. But my fish tend to be picky and only eat human food when it sinks. (The only food they eat off the surface is fish flake.) So, what foods that are fish friendly sink in water (I know peas sink, but i want to give them something else.) Thanks!

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