I finished the main aquascape and I have more remaining space than I thought I would so im looking for suggestions on what to do with the space thats left. I have plenty of rock left. There will be sand once the scape is finished. Thanks in advance!
How about a narrow, parallel stack slightly shorter than the existing one to provide more locations for coral attachments? Maybe not as long, with only one arch instead of two?
Leave it. Trust me, don't overdo it. Live with this for a while and you'll see what I mean. You're going to want to put things on the bottom and you're going to want that real estate reserved.
Looks great, but how about two small islands at about half the height of the main structure. It will add the illusion of depth to the scape if you angle them.