Maybe, I haven’t seen the nudis themselves though. The little things you can see 5 or 6 of in the upper shot and a couple in the lower scurry around on legs though. They seem to have a long proboscis that sweeps around and in the upper pic it looks to me like they’re using it to suck on the zoas like aphids on plants. I think the little brown specs might be something that forms from the bite wounds. Could be something growing too though I don’t know.