Nice looking tank! I like your incorporation of coral skeletons into the aquascape; it will look very natural once you have coral re-encrusting it.
I will suggest you add morr rock though, as I'm not seeing enough hiding spots for fish to tuck into at night. Especially tangs, they like to be secure at night and can actually become more susceptible to Ich when they don't have a secure sleeping spot. More rock = more comfortable fish = less illness. I haven't needed to medicate sick fish because I feed whole foods (guts and bones) and they each have several spots to hide, so they recover on their own and my CUC eats the Ich cysts when they fall off.
Very excited to see how this tank matures. My first ever large tank was a 210, I miss having so much space haha.