I would want at least a tank well over 100g for a blue face angel (or any large angel). In general, no large angel (Queen, Emperor, Passer King, Bluering, Blue face, etc) should ever be considered Reef-safe. While the occasional individual may behave, these fish grow big and eat all sorts of sponges, clams, corals, and inverts. As somone already mentioned, the full adult size for these fish are 12" in captivity and 18" in the wild (according to wetwebmedia). I've seen some very large (foot long) blue faces in people's tanks so this is a realistic adult size estimate.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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