Yes, they are considered a deep water angel as their collection range is between 15-200 meters (50-650 ft.) From what I have been told by a wholesaler friend, is that most of the specimens that show up in the aquarium trade have been collected in the shallower waters of the Philippines.
They will do better long term in a moderately lit tank that is kept cool. However, if able to obtain a healthy speicmen to start, a pair should have no issues adapting to a tank kept on the high end of the 70's.