Baby Rock/Flower Anemone?

That looks like a baby rock(flower) anemone.

Cool! If it won't harm anything in the tank I'll definately keep it. I'd really like to see its coloring once it gets bigger.

majano?

I have loads on a pice of Live Rock I bought today. Wasnt sure if they were a pest nem or not, but they do look very pretty

I have (had) tons of those, they do look pretty, stay small, but multiply quickly - a little Aiptasia-X will fix 'em if you want...

This one has not multiplied at all and it has stayed relatively small. I'm going to give it the benefit of the doubt for now.