Oh right! You have that starphire 50 gal.. now I remember
Have you ever seen the post on RC about the closed loop using a SCWD?
http://www.sparklingfloorservice.com...losedloop.html
It looks like it produces some awesome current and would work quite nice on a tank that size. I've thought about using it on my 120 with a bigger Mag pump but I forget what the SCWD's are maxed out at (gph).