I used the Marina for my s/w tank for some small macros and shrimp. I use it with the hydor pico pump instead of an air pump for constant and quiet flow. You'll need some tubing that fits on the pump and the marina inlet tube. The pump itself is iffy, I bought 2 and 1 didn't work out of the box.
My caution with this is that the water goes all the to the top and if you have any blockage of the return you're going to have a wet floor.