We had one in our old 75, and now in the new 90. Before the CL, we had 7 powerheads and an internal pump. Keeping the heat down was very difficult, not to mention the look. Much better when all you can see is the loclines, to me anyway.
here:
In this pic the return pump, and the plumbing lines are not in yet.
Here is what you see inside the tank, I used black ABS pipe, so it's less visible.
We have two pumps, and two SCWD's..only because we have alot of sps. That gives us 4 inputs, and chaotic flow..plus the double input from the return. In the old 75, we did it with one CL pump, and one return. We still had 4 inputs, 2 for the return, and 2 for the CL.
here is the old 75, this tank had an external overflow box.