I too have gone against what all have suggested as far as tank size and # of fish buuuut, I am housing 4 in all in my 8g, possibly a total of 4 1/2" of fish. ( gobys )I've chosen my fish wisely however, according to their needs and personalities. Bottom dwellers verses mid to top range. Agressive verses not. All my fish are non-agressive. Have their own likeable space, eat well and appear to be happy. As far as bio load I stay on top with WC and maintaining proper filtration.
Tank is looking great! IMO....
If I were you I'd get those Green Star Palys off your LR and glue em to the back wall-reason being they will totally choke out any zoas you may put on that rock-they grow extreamly fast-and it will look really good too. Just my experience with them.
Will the GSP grow onto the glass? I wanted it to keep growing so I can have a more natural look, but if I can get it to keep growing on the wall, that's cool too!