that my friend is not a ricordea.
its a Discosoma sanctithomae.
common names are: Bubble Mushroom, Warty Mushroom, Atlantic Bubble Mushroom
Warty Corallimorph, St. Thomas Bubble Mushroom.
The corallimorpharians are still badly in need of study and revision for their taxonomy. That said, the current standings are: three families (Corallimorphidae, Discosomatidae and Ricordeidae).
It does eat, so add some coral frenzy and/or zoo plankton on occasion to your feeding regiment, and keep other mushrooms away from them, as they do move and sting as a cnidarian.
Hope that helps. Let me know if I can be of any further assistance.