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well, when I see pics of millipora, they always have the polyp extended like and acropora, but there is also a long, sort of sweeper tentacle extended as well. Mine don't extend the sweepers very much
Only one of my millis do that (polyp extends MUCH further), it's the green guy below, all the other ones have a little more single size polyp extensions, I wouldn't worry too much about it. Now, if the polyps stay closed or are always tucked in, I would worry then.