A little late with an opinion, but I do so enjoy marine tanks.
As to them being so different , perhaps, but in the comps, I tend to vote for the setup that gives me the warm and fuzzies.
Yes, it would be nice to see more corals.
I know it's been brought up before, but I still think there should be separate competitions for marine and freshwater. Maybe if there were, there would be more entries for marine?
If we were getting a larger number of entries, I think a second comp would be a lot more warranted. As it is, there's never so many tanks that we can dilute it.