Mini Carpet anemone
A friend of mine gave me a Mini Carpet Anemone - Stichodactyla tapetum, and over time it split and made more that I could share with fellow club members. It's a very sticky creature, similar to other carpet anemones. It can catch fish that stray too closely, but for the most part mine have been well behaved. These grew to be about 1" in diameter.
Read more here: the-Mini-Carpet-Anemone