When it comes down to getting a dwarf angels, you have to take some risk.. another angel that you may want to look at is coral beauty. it is one of the angel that has the least chance to pick on corals.

I don't have any expensive corals in my tank because of these guys :) only hammer, frogspawn, acan, plates, some low end zoas.. I would be ok if they end up eating one of those.. :)