Looks good Sean!
Have you ever considered making those aragocrete arches that I've seen on the GARF site? (I've no experience with them, so someone tell me if I'm out in left field....
)(Jon, have you ever tried them?) Bangaii's seem to love to hang out under overhangs, and the open space on the right side of your tank looks like a good place for one. You could also incorporate some small shelves for future frags. I would suggest a piece of LR to bridge the gap, but you're probably looking at a one or two hundred dollars.
BTW, how old is your system? That's a ton of coralline you've got in there....looks good! What are you doing for calcium?
Mitch