From what ive seen of the two the Tunze 6025 shoots out more of a cylindrical stream whereas the korolia 4 is more of a cone shape (almost shoots out in a 180 degree angle from the impeller) and does not travel as far. In my case, a 20g i didn't want to have more than one powerhead so the tunze won because it could penetrate deeper and created less dead spots in my tank (i still have a few im fighting with). Maybe you could up the size to a 3 or 2, but i had corals too close to the powerhead that couldn't handle the flow.
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