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I thought the fish wouldn't mind that much if they had no pumps for an hour or two
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If the pumps are hooked up to a well established undergravel filter stopping the flow will after a time kill most of the aerobic bacteria that have established themselves in the filter media.
Then they are replaced with an-aerobic bacteria, which can release toxins into the water when the flow starts up again.
May not happen in an our or so, but I wouldn't want to risk expensive fish in the expriment
