Thought I would update this thread...
Decided to go with the 7.5g 12in cube. Got it all set up and running with 8lbs of live rock from fiji. Put a tailspot blenny in the tank along with a porcelain crab that I caught myself! Also added two sexy shrimp, some tapestry nerites and hermits.
light is now hanging from a frame I made from aluminum bar stock. I upgraded the leds to a total of 12. 4 whites and 8 blues. The blues are on a dimmable meanwell and the whites are on a non-dimmable 700mA meanwell. The tank is a crisp white with hints of blue now.
When the whites are turned off, the tank looks an incredible blue! All the corals fluoresce totally wild colors! This is a lot of leds over such a small tank, but its more for coloration. I need to find a nice, clean way to dim the whites so I can adjust the overall tank color to around 16000k ( I like them blue!)
Pics coming as soon as my battery charges!