I think 18" would be a bit shallow for an SPS tank. Unless yo keep the rock work really low the corals would be at the surface in no time. I'm really liking my 48"X30"X24" tank, it gives room for the fish to swim above the corals. But if you have short arms it might not work
You make some good points..
I do have shorter arms as well haha
I would really love to just run 1 ATI 8 bulb.. Maybe the Cube is not the way tog go.. I also love the 48x30x(20-24)
__________________ Ashr Red Sea Max 250, 66g Mixed Reef