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it depends on what kind of fish you have no fish can live for three weeks without food but you can get an automatic fish feeder from a pet store or you can get weekend feeders witch is food in a block dat does not fall apart and when the fish nibbles on it it gets food in return but i recommend to get both or have a trusty friend feed it

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Q: Im going away for 3 weeks and want to know if its a good idea to leave your fish with a feeding block?
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