Sad day as I am feeding my fish and cannot see my regal tang...after spending some time looking through the entire tank ...there he was on the bottom under the 3 foot shelf rock lays cold no movement
After having him roughly 7 years ago from a friend and gone through different changes and a tank move with a carpet surfing for enough time to render him bloody and dried up...the toughest fish I ever had...well R.I.P.
Maybe old age as no other fish show any stress signs...swimming and eating well...