We really like our Potter's. A beautiful fish that is always actively swimming. We don't have any SPS or clams in his tank, so I can't comment on that. However, when we added our purple sea plume, he did stop by to "investigate" a few times. This was only for the first week or so and he has not bother it since. He has not bothered any other corals. He is constantly grazing on the live rock. One a week I put in some dried algae for him and the wrasse. I feed mysis shrimp and the green food from Tropicorium. We got our from Preuss, I believe they are a direct importer of the Potter's.