Welcome Seamonkey
I presume then you have identified your anemone as Macrodactyla doreensis.
I have kept one of these for almost four years now, and mine has been a hardy specimen, moving from NO, to PC, to MH over time, with good feeding of raw shrimp, etc. It is probably about 12-14" across when fully expanded. Not too huge an issue in a 155g....
It is a popular host anemone, I have had several clown species take to it, currently it is a second home for a pair of ocellaris.
The LTA will host bangaii cardinalfish as well, and my pair has gone into the anemone at times, however the clownfish do not really allow them, or the porcelain crab, much access.
IME, the LTA is not as aggressive to corals as many other species, nor does it have the inclination to move once settled (providing conditions remain constant).
