I just purchased a new 6105 stream pump with the multicontroller. The pump makes a loud humming noise when it is set to 40% or > output. I purchased it new and have been running it for several days. Is there a break-in period for these pumps? If so, how long before the noise goes away. Is there any type of special procedure I should be doing to break this pump in? I am new to reef keeping and appreciate any insights you may have.