Honestly, everyone has their own opinions... I try to put their advice and the research I do on the fish and try balance it out. In the end, you will never know unless you take the risk.
I ended up purchasing the trigger, it is about 3 inches, pretty and big fella. It so far has not picked at any of the corals. I also have all of those corals you mentioned, but my frog spawn is a short tentacle. It has not picked at any of them. It swims around the tank, but It already decided to call an area it's home. It does not pick at big fish, but tends to chase the smaller fish away (clowns and a small yellow tang). I can see its teeth, they look like small grains of salt, and trust me it worries me, but if it continues to be this way, it'll stay in there.
I am upgrading to a 150G tank in a month or two

. Just waiting to prep the water...