Hmm... I've seen my LFS carry those before, I can't recall what they're called but they coexist with bangaiis in a 10' coral flat. I wouldn't think it would be an issue, though.
Upon even further inspection, these could be O. angustatus (Broad Striped Cardinalfish). Whether it’s the Ochre Striped or the Broad Striped, I guess both are hardy species. Would complement my PJs nicely. Still waiting for an ID on the red ones.