I see the file fish! you have a gorgeous tank steve, I sincerely hope it can keep up. is the file always up and about like that or does it tend to be reclusive?
edit: thought just occured to me. If down the road, the SPS are obviously not keeping up and are receding, would you consider changing your lighting spectrum to 6500K or so to get increased growth? Obviously at the cost of losing the brilliant colours in exchange for brown sticks, as well as a likely horrendous algae bloom. you could probably control the latter with biological control (army of snails and a foxface maybe?)