My Potter's has been fine so far, only about four months so far though. It is in a mixed reef dominated by SPS. I also have an acan, favia, both a hammer and frogspawn, LP toadstool, some kind of sinularia, zoas, rics, and gsp. It has not touched anything but I do wish it'd tear through the GSP. It was less than an inch long when I got it and still just barely over two inches. Hopefully it will continue to be a model citizen as it grows up.
I think it's just the same as any other Centropyge where you need to expect that it will nip and be ready to deal with it if it decides to do serious damage.