Yes, the anemone will likely wander around until it finds a spot in the tank it likes. That's how the powerhead mishaps happen.
BTAs will also split if the conditions are right. Years ago, I had a 75 gallon tank that I wanted to be just for a clown/anemone tank. I added two Maroon Clowns and one RBTA. By the time I took that tank down, it was filled with RBTAs.
BTAs will also split if the conditions are right. Years ago, I had a 75 gallon tank that I wanted to be just for a clown/anemone tank. I added two Maroon Clowns and one RBTA. By the time I took that tank down, it was filled with RBTAs.