I found my potter's at phishy business (instore) and it has eaten everything I feed it from day one.
...but, my potter's is not very SPS and LPS friendly. Its a nipper. I have had it with SPS and the SPS grow, but not much PE. With LPS, he nipped them enough to where their polyps never extended, so I moved him to a 20L softy tank by him self. He's too pretty for me to get rid of him.