I like that idea, personally! I have been thinking of doing the same...an external wavebox! I like this design because you still get the flow only a tunze can provide (Vortechs can't replicate) and there is nothing taking up space in your tank. As long as the box is large enough and has a wave interval, it won't run dry. I don't think you should be concerned about moving your flow if it is properly placed in the first place, if coral growth is impeding flow....time to frag or upgrade the size of your Tunze.
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