Like
@pcon stated, stocking corals as outlined in the Austin Lefevre video lowers the risk of nipping. If you watch the entire video he explains why. In my tank my angels ignore my gonipora, pipe organ & soft corals. I have a Regal Angel, 5 dwarf angels & a Goldflake (related to a Flagfin).
In the video he mention how fish will start nip a coral showing stress & advises removing stressed corals to recover in a frag tank before fish start nipping it. I observed this in my old tank with tangs. They would nip a stressed coral.
The clam would be tempting without a doubt.My angels love clam on the half shell. So I don’t have a clam in my tank of course.
As said above, several factors come always into play. Just plan according to what you really like. I love angels, CBB etc. so I stock corals suggested in Lefevre video. The fish are my passion, so if they do start nipping one of my lower risk corals I will still keep the fish/sell that coral.
Here is an example of best laid plans, but individual fish can surprise you... My Blonde Naso likes to “play” with an empty shell or small frag to get my attention. He swims to the top, drops the shell & catches it before it hits the bottom. Frags or frags on a lightweight rock are also fun for him. He doesn’t drop these but likes to pick them up & relocate them. Not kidding-lol! So I have to glue a little frag to a rock , he can’t pick up. I wouldn’t trade him for the world. Besides it is a good excuse for me to buy larger corals!