I have had a frogspawn living in close proximity to one of my patches of zoas for a while now. The frogspawn is very close but never actually touches any of the polyps and the zoas don't seem to mind it at all. Once when I was looking for a better spot for the frogspawn (further away from the zoas) some of the tentacles touched the zoa polyps and they closed up very quickly. Fifteen minutes later after the frogspawn went back to its spot the zoas opened back up and look healthy to this day.
I have also had a couple bright red mushrooms growing very close to another zoa frag. When the one mushroom is fully expanded it was actually touching the zoas. It looks like I may have lost one polyp where the majority of the contact was but the forty some other polyps look unaffected. In this case there didn't appear to be any negative interaction although im sure there would be some kind of chemical warfare going on so I just fragged off a couple of the mushrooms so they aren't touching anymore.
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