Ricordea Yuma Mushrooms (Ricordea sp.) are a great beginner coral, as they do not require pristine water or high light. They are frequently found among shallow reefs in the Atlantic Ocean. They feed on small fish, crustaceans or plankton that falls onto their surface. They do well in dirtier water with high nutrients, which they filter out an use to grow. Medium-low light is best, and they should have moderate-low flow, as to keep debris off of them.