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Yeah I’ve had all 3 of those for about 2 days right now. I’m just trying to get them used to the lighting and water before I place them in the tank.Looks like an acan to me, at least at this angle. Or, it's one of the corals called "acan lords". They got reclassified and are now Micromussa lordhowensis, which is shortened to the trade name "micro lord".
Assuming it is an acan lord/micro lord, it should be fine pressed right up against zoas, as micro lords are wildly non-territorial. They'll sting stony corals that touch them, and pack a whopper of a punch once they are mad, but generally don't seem to mind zoas. A lot of corals don't really seem to mind zoas.

