I only have this to say ...
Worry about keeping your first anemone ALIVE before you get concerned with it splitting and taking over the tank
If you are lucky enough to have it multiply, there are ALWAYS members who would love to have your extras.
It took me 3 tries to figure out how to keep one healthy. I was fortunate to get a "baby" from
Harleyrider that finally got me going. And I must say a "Tank raised" BTA will increase your chances of success (IMO).
I will now fade back into the Ethereal Plane ... content that my wisdom has been imparted to you ...