its a squid, it kinda squirts water out those two ports on top but it switches... few seconds out the one side few out the other so its like you can have waves comin from both sides of the tank instead of just one flow from one spot all the time
Look into diagrams of Hang on Back Closed Loops, then stick the SCWD into the diagram with an extra output. OzReef has one listed under "Water Circulation System".
That was a pretty "quick draw" on that response, Squidd!! You're getting good, man!
Most questions I have are already being/have been discussed. THis site rocks! :happy: Thanks to everyone who contributes.