Mine began chattering the other night I had to get up and unplug it as it was keeping me up(im about 10 feet from my tank) I returned from work and plugged it back in and is silent 2 days running. I believe earlier in the thread there is a suggestion to run it out of water. Then you could always pull the prop out and start over. Or shaving the prop but that would seem to be a last resort deal.
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