The Tongue Coral, Polyphyllia sp., also known as the Mole Coral, Slipper Coral, Green Tongue Coral, or Hairy Tongue Coral, lies low and flat on the aquarium bed resembling a tongue. It requires calcium, strontium, and trace element supplements to ensure that its calcareous skeleton is able to grow. It is a solitary, aggresssive coral with short stinging tentacles with white tips that pack a powerful punch so be careful when handling and don't place near other corals. The Tongue Coral requires strong lighting and a low to moderate waterflow while being placed on the bottom of the tank over a sandy substrate. The sand is necessary as a hard surface can damage the coral. It is a locomotive coral so plenty of tank space should be had for this coral.