A SCWD is a water Switch Current Water Director
http://www.jlaquatics.com/phpstore/s...uct_ID=wm-scwd
You could hook a couple up to each Little Giant and create some nice random movement. Just make sure you make it easy to take them off and clean them when they get jammed with debris.
I try to go for 30-50 times of flow in a tank so for a 230 gallon I would aim for 6900-11500 GPH of turn over. 2 Little Giants and 2 Vortecs would be 7500 GPH. Probably enough for LPS and softies. You can always add 2 more when you are ready to try some higher flow corals
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You could also think about adding a maxi-jet mod if there are dead spots at the back of the tank after everything is set up.
http://www.jlaquatics.com/phpstore/s...ID=wp-mpsf1600
You can hide them pretty easily and they are darn cheap.
HTH