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I have three RIO 2100 pumps for my UGJ system that I just finished building. Those things are loud! Even with just one on there is a very noticeable hum even in the next room. Any suggestions as to how to reduce the noise? Or any suggestions on quieter pumps? The Rio's were 40$ each so I couldn't believe my ears when I turned them realizing that I could not live with that noise. Now I am really worried about what my FX5 will sound like once I turn that on...