mattsilvester
Team RC
A great talk was given at MACNA this year by Copps on Angels and reef tanks. As a general rule you can progress through the various genus of angels and label some as more prone to nipping corals than others. You may have a easier time getting an angel to adapt to your tank if you get them on the younger size. The older they are, the more they tend to have a specialized diet.
There is also a difference between one that appears to nip at a coral a few times a day and one that will pick repeatedly at a coral. Most healthy corals can will be fine with the rare nip by an angel; also repeated nips may be caused by unhealthy coral or the fish may be eating the slime.
Anyway, I have Imperator; Majestic; Regal; 2 Flames; and Coral Beauty in my 215 and they leave the sps & clam alone. I avoid the fleshy lps corals; but do keep a hammer bubble coral.
Whilst this is the best general advice, and generally I concur with it, I feel it may be useful to balance it with my experience.
I added a 3" juv. emporer to my tank 30 months ago. It was a new tank, with a dozen or so reasonable sized colonies or sps and softies. At first, the fish was fine, didn't touch anything...... then patches started appearing everywhere...... at this stage I didn't catch the emporer in the act, but he was the prime suspect. As he grew quickly, so bit the coral damage, until it was obvious that he was just going to eat the lot...... I tried every type of coral you can imagine with him..... sacrophytons, leather finger corals, star polyps (noth green and purple), sps....... the only thing that was anywhere near "safe" was montipora's...... but I think in time they would have come under teh axe too.
My emporer is now 7.5"+ and growing, so that is evidence enough that he is well fed......
By posting this I am not scare mongering, but there are people like Gary who get lucky and people like me who don't...... and then there is plenty of middle ground in between.