I don't know that they are distastefull, tho I suspect that smaller predators may know the dorsal spine when locked in might not be pleasant, not sure that will deter a Panther grouper, as I recall they can exceed 18" FWIW I recall my bro in law had a 12" Panter and it scarfed a 5"
dwarf lion in one gulp, it moped about for several days but recovered.
I have heard that because they have then itty bitty scales and a thick mucous coat they are less apt to get Ich, but over the years my observation is that without nutritional needs dealt with they secumb to starvation if not secondary issues