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I have both types of powerhead and they are very different in the way they create flow in your tank. Koralias produce a very wide flow patern that is really quite different from the more directed flow of the Tunze. I have a hard time believing that there is any type of Tunze/Koralia legal issue, as these pumps are very (very) different in design.
Personally, I think it's an apple and orange comparison. Different type of flow, different price range. Basically, it depends on what type of flow you want in your tank. If you are looking for Tunze "like" flow for less, you might consider a maxi-mod or even a seio.
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