I wait until mine stop, and they never have: I would rate that event in years. If you have the cash and are stocked to the gills, btw, a spare return pump is not a bad idea.
If you need to clean a pump, however, an overnight in white vinegar will usually do the job beautifully. Vinegar will not hurt your tank if some should be left in it.
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Sk8r
"Make haste slowly." ---Augustus.
"If anything CAN go wrong, it will, and at the worst possible moment."---St. Murphy.
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