I have had both and prefer the Tunze. I ran my MP40 in lagoon mode at 70% and the whine of the ramping to the higher speeds really annoyed hubby and me (aquarium in the living room).
I notice a difference in the flow too, the MP40 did not move the sand around but I am currently getting drifts with the Tunze (the max is set at 60%, random flow, sinus wave). I will have to work on the positioning and the Profilux program as I don't like having to unbury my rics and zoas.
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