These sound cool. Do they have adjustable speeds? (as far as rotation)How the sea-swirls are designed, then only rotate 90 degrees each way so you can set them to rotate 90 degrees from any point and back. So take Chuck's old 75gal for eg. He had his mounted to the side of the tank so the sea-swirl start point was straight out and then it rotated all the way around to the back wall and back. With mine, it was mounted in the center so my start point 30 degrees to one side around to 30 degrees to the other side so it all depends on you. Here are some pics to show you what I mean...
Ok, so if I'm right.... no sump = cool animated pictures.If you've never seen it before, look at the last pic on this page. This is Sherman's tank that has no sump at all!
http://www.reeffrontiers.com/forums/showthread.php?t=11059&page=12
That's a nice tank. Without a sump though, where's the skimmer? Unless there's a hangon that I'm just not seeing.