i replaced a Koralia 1 with a Tunze nanostream 6025, and it was a huge upgrade in flow. Although it seems more linear than the wide flow created by the Koralia 1. I've had the Tunze break in the same spot, the clips that secure it to the magnet, but have had no problems as of yet with the impeller. As soon as it goes, the Koralia is going back in.
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