I was worried about the size as well, and when I first got it I was horrified at how much room it took up in my tank and was thinking I should have gone with a controllable Tunze . However, the benefits of the wavebox far outweigh any "unsightliness" or real estate usage, IMO. I couldn't believe the polyp extension I was getting from my corals in just a few days. Milleporas are incredibly hairy(and they were pretty hairy to begin with) and corals that previously didn't really have polyps out were now true fuzzy sticks. I must say it was definitely one of the best things I've done for my tank and about a week or so after I started using it it started to blend in with the rest of the tank and now I don't even notice it.
Oh and the fish love the flow too
