I've got a SCWD running on the return plumbing. It switches every 5-6 seconds. The plumbing runs behind the foam and under the sand. The left return line goes to the back of the tank where it then tee's off: one bounces off the back of the tank and goes to the left, the other bounces off the right side of the tank. The right return goes toward the front of the tank and it tee's off, too. One goes to the front left corner of the tank, and the other bounces off the right side toward the back. I think I'm going to put some type of nozzle to increase the water velocity coming out. (Would penductors do this?)
Any thoughts would be appreciated. (Just don't make me spend too much more on this!)