yeah I don't really excessively feed but I have 3 types of zoas ranging from 3 polyps to like 5 and I have a hammer coral which I added yesterday to my tankCould just be from washing hands before cleaning. Just something I read.
Nitrates seem low, they should be higher for the anemone and any possible corals.
Any fish? Could be irritated from a clown trying to host (if you have one).
What is the lighting, flow, etc.?