Can you not just get one of those massive feeding blocks you chuck in when you go on holiday for two weeks?
Most aquarium fish are fine only being fed once every week or two for a while. Lowers the tank maintenance requirements too.
Goldfish in particular tend to thrive on weekly feeds in properly established tanks.
@Stonehedge started
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Can you not just get one of those massive feeding blocks you chuck in when you go on holiday for two weeks?