more info found....
"You probably didnt get as lucky as you think, cause it probably is Anemonia majano , a small anemone which most people consider to be a pest. In most cases, this anemone can reproduce quickly and spread thoughout the tank, and like Aiptasia, can sting its neighbors quite badly. It's unlikely that you will find a biological control such as peppermint shrimp for these, however you probably will have better luck using an injection of limewater if you find that they must be controlled in your tank."
"Anemonia Majanos, which quickly split and made more of themselves and spread. Soon I had 40 of these guys in my tank. They are attracted to light, and will climb the rockwork to get to the top. Their sting is damaging to corals, and eat up 'real estate' other corals could use. This is definitely a pest anemone, and using a syringe with boiling water, I removed every one of them."