One of the problems that has presented itself is one of the cords from a power-head. It was my intention to tuck the cords between the glass and the rock wall but one side was just too snug so it ended up looking like this.
Not wanting it to remain as visually distracting I took an old 18inch Eheim spray bar that I'd held onto for over a decade for just this exact reason and cut a slit in it lengthways.
I applied the same epoxy and sand treatment to it as I did to the back wall making it look like this.
I then squeezed the powerhead cord through the opening so it eventually slid freely inside the spray bar and placed it in the tank.
Close up of bottom cord entering spray bar from powerhead.
And the whole thing in place.
Obviously looks a little artificial right now in the newly set up gleaming white tank but figure once there is some coralline on it and a few corals in front of it I will be happier than if I'd just left the bare cord.