alright, so here's the status of this tank. i set it up several years ago, let it run, had fun with it, and then took a break from the hobby. i got rid of the livestock, but kept water flowing in the system. about 2 months ago now i did a 100% water change, separating each tank from the system one at a time and then reattaching back to the system in order of fresh new water. during the break i ran no lights, so all the rock is colorless, however it is very established and full of non-photosynthetic micro life. i've been restocking the system with corals and fish, but haven't really put much of anything for corals in the display yet.
the rock is made into three towers which are vertical from the bottom of the tank to the top. the center tower wraps around the overflow, which is 4" off the back wall, and the other towers are also at least 4" off the back wall. the tunze wave box hides behind one of the end towers and fires down the back length of the tank unobstructed this way. this gives me a nice view from the back of the tank also, and gives the fish plenty of room to swim all the way around the towers. the tangs often circle the towers and it gives them lots of swimming room. detritus buildup is minimal with this rock configuration also, as the rock is only one layer thick except for near the base of the center tower which does reach clear to the front glass.
here's a current fts:
here it is from the back:
far right tower (front the back), which hides the wave box and a heater:
center tower which hides the overflow:
and the far end tower (left side from back):
now i need to get to stocking...!