Your tank is looking absolutely fabulous except for one horrendous little thing. It is completely overrun with gorgonians! You need to get rid of them at once. I can offer my services as a gorgonian disposal. I'm here for you man, and it's only your best interests that I have at heart with this most generous offer.
Fish look great, corals look great, everything looks great. Interesting about the tang. I wonder if it's a sort of "teenaged" colouration?