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I see jasmine polyps and zoas...until I look in the third and fourth picture and see aiptasia. Aiptasia-x will be your best bet for this one as it won't bother the polyps around it.
You can easily kill off the aiptasia by shooting boiling water or lemon juice into the mouth of it or by using a product like aiptasia-x or joe's juice. No reason to take it back, just fix the minor issue.