Environmental: Conditions
Habitat
Chief consideration must be given to size of the system and provision of physical break-up, i.e. decor. These angel species do get large, but even when small only do well where provided lots of nooks and crannies.
Chemical/Physical
A stable, optimized environment is the ideal for most hobby species of marines; Euxiphipops angels are no exception. They do best in higher pH's (7.8 plus), with little metabolite detectable (as little nitrate as 10 ppm is a good target). These fishes visibly brighten up after water changes.
Filtration
As you might surmise for such large, active fishes with so much rock and coral decor, you want to have an oversized circulation and waste-handling system. If not a sump-type arrangement, a bonus size outside power and/or canister filter set-up, with, of course, a functional protein skimmer.
Behavior:
Territoriality
Euxiphipops are mainly agonistic toward members of their own and subgeneric species. Therefore, one member of the group to a tank. Oh, and if pushed or extremely stressed they can bring their built-in saber of a opercular spine into blazing action toward tankmates and your hand.
Introduction/Acclimation
It's best to place these angels near last in a well-established tank, turn the lights off, and observe them CAREFULLY to make sure they're eating ASAP and ongoing.