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The genus Genicanthus is regarded as reef safe. However, all the other saltwater angels range from being iffy with corals to down-right coral consumption.I don’t agree
Some angels can be reef safe lamarck's angel are reefsafe
i have also had very good luck with some flames, coral beauty’s
Juveniles are usually reefsafe (many large angels species as well)
They will not eat all your coral within a day they will start nipping and slowly eat coral you will notice things closed when they are not supposed to be
I have also had a hipo tang that would eat stressed zoas so that makes me think no fish is really reefsafe they are all a gamble you need to keep a eye on your fish, feed them and don’t put stressed coral in your display
The genus Genicanthus is regarded as reef safe. However, all the other saltwater angels range from being iffy with corals to down-right coral consumption.
With some species of Centropyge which are deemed safer options, such as flames and coral beauties, it's impossible to say as a whole they are safe. Some individuals never nip, some nip immediately, and others are safe for awhile then begin nipping. But this is all dependant on the individual specimen. So nobody can say for certain whether an angel is safe or not, however if the owner in question is risk averse, than angels outside the genus Genicanthus aren't a great choice.
While nipping may be a slow process in many cases, that is not true in all. I have observed on a few cases an angel completely dessimating 10+ coral colonies in the course of a single day.
It's anecdotal either way. Even with an angel specific diet, and fish being well fed, IME angels are hit and miss. In 2 of the instances where angels went wild on corals, they were fed multiple times a day, a varied diet, and sponge was a part of the diet. So, in your experience they were fine, but they weren't in these instances. There are no guarantees. Some may be fine, some may not be. No one can say for certain until the fish is in the tank, and even then some fish's behavior changes.

