When it's only a short period of time, then they can do without food for a while (one week maximum), with the exception of newly born fish, who need to be fed daily.
When it's longer than a week, I ask someone to feed them for me about three times a week and then I leave carefull instructions on how much and what type of food for each tank...
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"Death is lighter than a feather, but duty is heavier than a mountain..." - The Eye of the World
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