IMO.. I would think lighting is going to be tough... almost anything over a tank that shallow is going to be intense, and with only 6" your won't really have room to acclimate to the lighting, at least in a "start at the bottom and move to the top" sense.. and as things grow or you add new, adjusting your light height may end up frying the tops of "older" frags or not having enough light at the bottom for "newer" ones...
Powerheads aren't "small" either.. figuring out your flow pattern might be tough given the lack of space to mount them...if you need them that is...
Not saying it couldn't work... just some things to think about...
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I'm new to this saltwater thing, all comments should be taken with a BUCKET of salt! :-)
-Stacey
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