Return Pump vibrating while unplugged

wontonflip

I failed Kobayashi Maru
Anyone ever unplug their return pump, but it keeps on vibrating? It just happened tonight. I unplugged it for feeding time, and I noticed something was vibrating. I unplugged everything except lights, it was still there. So finally, I realized it was my pump (unplugged) but it was as if the impeller was still going. I shook it a little and it stopped.

It's due for a vinegar bath anyway. just thought it was weird.
 
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