i post many times all over this forum so you can search for more info.
they are like dwarf angels. treat them the same way.
deep water butterflies so their diet not primarily coral based.
i've kept declivis 3 times, both times completely reef safe, 1 time ate my favia.
keep them well fed will be ok. declivis, tinkeri, mitratus, burgess all the same in terms of captive requirements
hope that helps.