I didn't get any of the ones you're referring to, but I have had my Potter's Angel for about a year and a half. 1hr drip acclimation, then hang bag in tank for 15 minutes to equalize temp, then turn lights off for a while when introducing to tank. I always feed frozen mysis, and alernate between frozen spirulina-brine, frozen mega-marine, frozen mega-marine-algae. I also feed cyclopeeze once or twice a week. He's so fat that he swims funny. Also of note, my tank is very established. When I look at the tank with a red light at night, there are thousands of little critters running around all over the rocks. This undoubtedly helps, as Potters Angels constantly scour the live rock for food.

I have never had him bother any of my softies, clams or sps. I'd bet that this would not necessarily be true of other individuals.

Hope this helps!