Is there a big difference in overflow boxes? What I mean is, are there different companies that make them (I assume there are), and are any better than others? From what I was told today bt the person at the fisth store, I would be better off having them. He explained it to me and even showed me on two different tanks how they operated (one had the boxes and the other had what he called a "siphon" setup). Also, according to him, the biggest difference between having them on the back or in the corner was more a personal preference. Is this pretty much true? The way I see it, if there is any viewing from the side, the corner units will somewhat block your view, especially when you add the live rock around it. I'm amazed at how much I learn everyday about all this. I'm more and more excited about starting up, even though I know I still have quite a bit to learn about it all. Thanks again for all the help I've been getting here from all of you!