I would love to have a FOWLR tank along with a reef tank but I prefer the corals than fish so
It is a statistics game. It is not a binary item where 100% of the type Angelfish of species A will not eat coral, and 100% of the time Angelfish of species B will eat coral. It is all the "likelihood" of it happening.
I find understanding why some fish are more likely to eat coral, and others do not, helps in making the right decision for oneself. Additionally, determining if you are prioritizing your coral or your fish helps in the decision.
If having perfect coral health is the most important thing for you, then I would strongly recommend avoiding all angelfish because there is a greater than 10% chance that any angelfish will nip at coral.
If you are OK with the occasional nip at your coral, then there are some angelfish that are far less likely to eat coral than others. At the top of the list of angelfish who are
least likely to eat coral are the Genicanthus genus of angelfish. This genus includes the Bellus, Japanese Swallowtail, Lemark, and Wantaenabi. They are less likely to eat coral because they are from deeper water, where there is not enough light to support most corals; as a result, they naturally develop a diet that does not include coral. In my experience, they have a less than 20% chance of eating coral. The next best angelfish genus that is unlikely to eat coral are angelfish of the genus Centropyge, aka Dwarf Angelfish. This includes the Coral Beauty, Lemonpeel, Flame, and Golden Angelfish. In my experience, these have a less than 35% chance of eating coral. I also find the sole member of the genus Pygoplites, the Regal Angelfish, is also less then 35% likely to eat coral. All other angelfish, for the most part, are very likely to eat coral (better than 50%). You will find people who have an Emperor, or Queen, or Blueface angel, which they claim doesn't eat coral, but these specific fish are the exception to the rule. Most of these fish will almost always eat LPS because that is part of their diet in the wild and some will peck at SPS.
It is important to remember that the natural behavior of a healthy angelfish is to peck at things that potentially are food and determine if it is something the fish likes or not. It is to be expected that a fish may nip at a coral as a normal test. The key is whether they develop a taste for coral or do they have to eat coral because they are
not being kept stuffed, typically out of fear of raising nitrates or phosphates. I find 90% of your problems with fish aggression and coral eating can be solved by feeding them frequently and heavily. A fat and happy fish doesn't have to eat coral to survive.
When I had my tank with coral, my centropyges would nip at my clams so much that the clams would rarely open and eventually die. This is normal behavior for Dwarf angels.
I personally hated the large restrictions my coral put on my fish selection, so I started a large FOWLR to have all the fish I really wanted. I eventually took down the coral tank because it just required too much of me. At the time, I was building my company, and it wasn't fair to my business partners not give them all my energy. One day, I plan on building out a large reef tank, but my FOWLR is providing me with too much joy! It is amazing the joy you can have when you practice "biosecurity".
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