I've got a AGA 125 gallon that I'm setting up as a reef, I bought a cheap glass drill bit on eBay (about $9, including shipping), drilled two 1.5" holes, plumbed them together to the input to a Barracuda pump, and have the output going to a Calfo-style output manifold over the tank, works great. I'm using 10 loc-line nozzles as the output of the manifold. Thought I'd give people a look...
Diagram of the CL
circuit (doesn't show the separate overflow/sump/fuge circuit):
The back of the tank, after drilling, and painting black:
Plumbing in the back (you can't see the pump, it's in the lower left hand corner):
The return manifold:
The manifold, on the tank:
'Running' pics (no, that's not my final aquascaping!
The only trouble I had with this is that the Barracude is a bit too powerful, it was blowing my substrate around a lot. So I just restricted the output with the ball valve. Per the manufacturer, that won't hurt the pump, and will actually save electricty. If I had to do it again, I'd get the Reeflo Dart, a 3600 gph
pump, rather than the Barracuda, a 4500 gph