I think they are rainbow anemones. i bought them from Ellis aquatics 5 years ago. They keep on splitting, my tank is now full of anemone. For sale $30 each. I have a rock that has 3 anemones on it for $75.
I’m heading out to pick up two tonight if anybody from Riverside area wants to buy one and have me grab it and bring it back for them I can do that as long as you let me know within the next hour
Nice meeting you as well. Enjoy it. It will spread out soon. I saw the pic. I agree looks better in your tank than mine. I think that was one of the big ones.