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I was just speculating as I have never owned an MP40. Just saw pics one of that was put too close to the sandbed once. The Mp40 is more powerful than the 20 isn't it? I wonder how close you could put that puppy to the sandbed. It would be really nice to have both and try them both out. I don't know too many people who have/had both though.. They are so expensive, you typically either have one or the other and you love them because they are so damn expensive! :-)
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I have both Vortech MP40w's & Tunze's in my reef.
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Have all 3 Tunze on and yeah the sand certainly gets blasted bad in a few spots. Have to wait and see if that bacterial coating on the grains thing helps me any.
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I place rubble in the high flow areas where the sand gets blown away, works well and in my opinion looks quite natural.