Moorish Idol feed. Sponge??

[RD]

Bob Fenner has seen MI kept successfully for years, so none of this would come as any big surprise to him.

I just find it sort of odd that the health of most marine fish depends on a varied diet consisting of primarily live or frozen food and this fish, one of the most sensitive in the hobby, has had greatest success with a pellet.

Says who? I saw a marine tank that was full of the some of the most difficult to keep species, Butterfly Fish, Parrot Fish, Philippine Regal Angels, Majestic Angels, Rock Beauty, Moorish Idol, Achilles Tang, and numerous other species, and they all thrived on an exclusive diet of pellets.
That tank suffered a major crash a couple of years ago, but at the time the vast majority of the fish were over 12 yrs old, and none of them had ever seen live, or frozen food.

Bob Fenner has seen the same tank, a number of times.

IMO it's impossible to talk about comparable quality in foods, unless you are running long term feed trials, and feeding said food exclusively. No frozen, no live, no supplements at all. I suspect that many aren't willing to do that, so it's impossible to compare something that you've never personally tried. I also wouldn't be so quick to judge what Pablo knows, or doesn't know about the dietary requirements of marine fish, you might be surprised.