This is question is a good litmus test for which members know what their talking about and which don't; because it's unequivocally Tunze. That's one of the rare few things that everyone who has spent time in this hobby knows. It's almost an insult to even put Hydor and Sicce into the same comparison as Tunze. The only noteworthy competitor are the Vortechs.
Now, if Eheim made powerheads...
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