Yow, Mark you have an MP40W in your hot little hands but are able to wait until Sunday to install it? Talk about patience! They're so relatively simple to slap on, although take care with the alignment & spacer setting for glass thickness. I recently added a second MP40W to my 75 and it's great. I previously ran the single one at long pulse, full power and with a quiet room, it was quite audible ramping up to full speed. Now with the two, I'm able to run them around 75% power, making things noticeably quieter. Flow is much better at the previously 'other' end of the tank as well. When you get yours going, I'm sure you will see a lot of stuff getting kicked up that you didn't know was in there!
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