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Fluval U4 internal filter

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How well does the U4 work as an internal filter?

It would be an additional filter for me, sorta like a powerhead per say. Since I'll have a Fluval 406 it might not be enough flow around the whole tank.
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Sorry to bump an old thread, but did you end up getting this filter and do you have any feedback so far? I'm thinking of putting two of these at opposite ends in a 90g tank. I've heard some pretty mixed reviews about them. I'm not too worried about the bulkiness as I'll have enough room in the tank for a decent setup. I'm more worried about the force of the spray bar and how it may push plants away from it, exposing the filter to view.
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