The rock wall looks nice, but it can turn into a algae producer if you don't get enough water movement in the back. Try and stack it so there is space behind it, and use epoxy to hold it together once you get a structure you like otherwise it could topple later on and hurt some of the inhabitants. I would also recommend curing with the lights off, do many frequent large water changes and make sure you have a ton of water movement going.
Mike
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