I will flat out say (and for me that is unusual) don’t do the rock wall. I had it in my tank 10 years. Just changed it last month.so glad it is gone. The wall kills water flow, makes cleaning harder, give fish less room to swim, and only gives 1 side to put coral on.
Before...
After, I justed started a complete redo last month so it is still in progress.
Honestly I “liked” the wall type. But thanks to you guys, the 2 separate islands it will be. It didn’t take long for it to grow on me. Thanks everyone.