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.
Read more here: the-Mini-Carpet-Anemone