Looks like a bubletip. Not all bubble tips "bubble" in an aquarium. I have two RBTAs and neither of them bubble anymore.
Look at the column of the anemone..... is it covered in little white spots? If not.... it is not a long tentacle.
Also.... it will not stay small if it is either anemone. 12"+ across.
I learned this earlier this year as I was sold a misidentified anemone.
Just an FYI as you mentioned it "bubbles sometimes".
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