Pearl Bubble coral
This is a coral from the Bubble family. It has been suggested it might be a Pearl Bubble Coral, but I've not seen one like this before. As you may have considered, it kind of looks like a Ricordea. This one has a mixture of pink and green bubbles. At night, it looks far different. Bubble corals are LPS corals, and need gentle to medium flow, and reef parameters to thrive.