The closed loop uses an Oceans Motions Squirt which is modified so that only two (out of four) ports are used to alternate flow. For those familiar with a SQWD, the modified squirt performs a similar function, except it is more reliable and doesn't have as much head loss associated with it. It is basically as if there is a rotating 90-degree elbow that occilates flow between two outlets.

The closed loop intake has a 1-inch tee connected to the bulk head inside of the tank. There are intake screens on each end of the tee. This was done to help prevent fish and other animals from getting sucked up agains the intake screen due to the high velocity of water at the inlet. So far this has worked well. A rose anemone found its way into the intake, but I don't thing any thing would have prevented that. (It actually lived through the ordeal, but I gave it away after it healed up.) The intake is hidden behind the rock work.

The closed cloop outlets are terminated with flex line and nozzels. These are nearly invisible in the tank due to the way the rock work has been positioned.

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