Nothing, LOL. There are 2 (that I am aware of) species of ricordea. Ricordea yuma (Pacific) and Ricordea florida ( Tropical Atlantic). Telling them apart is easy. The Floridas usually are found in multi-mouthed polyps with no pimples on the mouth and a more uniform pimple/bubble size. Yumas are usually single polyps and have "rows" of pimples with pimples all the way up to the mouth.