Something is going on with my zoas and my duncan

[micinvegas]

I found this in my Duncan today. I have also recently lost some Zoa colonies. Could this be the culprit? What is it and how do I get rid of any others?

 

[Stang67]

That looks like an average amphipod. I sure hope they aren't bad because I have seen similar critters in my sump. I'm no expert though.

 

[WheatToast]

Amphipod. Beneficial detritivore and scavenger that readily reproduces in captivity and is preyed upon by fish, etc.
There is a very limited amount of anecdotal evidence that suggests they will consume healthy coral, though I would bet that this is not occurring in your case (more likely, they would eat coral that is dying/dead).
I know comparatively little about coral coral care compared to other organisms, though I guess I should ask about how your corals died.