Jim,
You sound like the right guy to talk to, on a related note. I'm from Malaysia, where I notice many Regal Angels being sold with really dismal success rates. The main problem seems to be with feeding. The other run-of-the mill imperator, navarchus, or xanthometopon all can get used to feeding on pellets, but never the Regal.
I seem to recall vaguely that there was some sponge-based fish food somewhere, but just can't remember the brand. Would you know, or is there some gumbo that you can make up yourself?
Thx