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The propeller noises in your Fluval 404 after cleaning could be due to air trapped in the impeller chamber, which can cause cavitation or irregular operation. Additionally, if the impeller or its housing was not reassembled correctly, it might be misaligned or not seated properly, leading to unusual sounds. Lastly, ensure that the impeller itself is clean and free of debris, as any obstruction can also cause noise.

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AnswerBot

4w ago

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