I'll looking to keep a mixed tank with softies and LPS on bottom and middle with SPS on top. Not sure exactly what species yet. Yes, It looks like the two A80s won't be enough. More like 2x A160s or 1x A360.
Although it does seem like most running a mixed tank this size are running there lights in the 90w range at 50-60% intensity? Sound right?
I was really wondering if there are any real advantages to running two smaller single units spaced apart rather than one center light in a cube. After looking into it further, the two would reduce some shadows but seems a single would be better for a me.