Aquascaping looks good for a fish only tank. If you are going to go with a reef tank I might consider putting some rock in your sump and letting the corals fill up the open water space. It's surprising how quickly corals grow. You probably don't want them touching the water surface right off of the bat. Right now the closest coral I have to the water surface is about 6" from the top of the coral (the coral itself is about 8" tall). This is just my personal opinion as I've seen beautiful tanks with rock piled really high as well.
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