roger just wanted to let you know i finally recieved my two stream 6000 pumps last week to go along with my multi controller and two tunze electronics. i have all four pumps running off the multi controller with the two streams in the back corners and the two electronics in the front pointing at each other.i have this setup on a 65 gallon 3 ft long rr aga tank.well the fish and corals seem to love the flow and my 3" sand bed has remained intact.this is a great product and worth the wait !