Bro, It is not advisable to add an Golden Angel when you have a Coral Beauty and Flame established in your tank.. It is a shy fish and will be targetted by the old Angels.. Once it is too intimidated, it will be difficult to get it back to top form.. Best to be the first fish in your tank.. lol... It is the Coral Beauty and Flame i am more worried about.. The nox is quite shy by itself..
Even if it is a stable fish, its nature is still shy and timid...