when keeping high end angel fish which piece of equipment is most important.. a ro di unit or a uv sterilizer...
emperor angel
queen angel
blueface angel etc expensive
Anti-lock brakes & dynamic traction control. They can prevent the accident =)
But in all honesty, yes, all of what has been listed. However, the FIRST thing you need in caring for any of those fish would be a LARGE tank. None of those fish are small, and all require significant sized tanks.