I know it will get big, and I love it! I already have one big 8" anemone in that tank, I definitely love it more than any of my coral.
This anemone is going back today, though. I noticed that when the fish store guy as taking out of the glass bowl he as in, he tore his foot in two places, and he said to bring it back to exchange it. Its the most beautiful one there, but id rather him not die in my possession because the store guy tore his foot.