I have the same problem with my 50, it is loud and it is coming from the motor itself, plus the fan whistles. My Gen-x 70 is much quieter. I removed the blade to test listen and it helps, but still not a solution. I am using it on a MR-2 skimmer. I love the skimmer, hate the pump, I bought both used, but I saw both running when I bought them and i didn't think they were that loud, but they did have the TV volume up beside the tank and I may have not paid attention to it.
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