weird noise

  1. C

    What is this weird noise coming from my skimmer?

    I have a reef octopus 1000 hob and it just started making this weird noise, any ideas what is it, what's causing it, and how I can fix the problem? Thank you for looking!
  2. DcoarM

    Mp40 Making Humming sound

    I bought an mp40 today, brand new. If I have it above 50% it makes a loud humming sound. Video attached. Any ideas?
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