The Porcelain Crab, Petrolisthes sp, features a beautiful marbled patterned round body that can come in various colors with light blue accents and large pincers. They thrive in groups and will spend most of their time grazing live rock and sand for food in the form of plankton or algae. If they are unable to scavenge enough food they can take supplemental feedings of meaty foods (and will also clean up uneaten foods for other organisms). 

The Porcelain Crab is best kept in tanks with plenty of live rock and a nice sandy substrate. Good water flow can also help as they will filter the water column for small food particles. Color and pattern will vary from specimen to specimen.