A very interesting mod. Personally, I think that if you are looking for flow you might be much better off to purchase a Sureflow mod and Suregrip magnetic holder. I'm using 2 modded 1200 pumps in my 8' long 200 gallon and have to use the smaller propeller because the large one blows sand all over the tank. If you want flow, that is a great way to get all you want at a reasonable price.

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Dr Hank's 200 gallon Reef Tank
http://www.aquariumforum.com/f46/drhanks-tank-3440.html