Questions - Need some input

I have or should say had a acro frag and noticed that it was not doing well. When I looked closer it had a number of what I think are amphipods on it and looked like they were eating it. I have looked on the web and it seems that most people feel that amphipods do not eat corals and are only cleaning up dead or dying tissue. The now seem to have moved to another coral. Any advise or comment would be appreciated.

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