The Red Doughnut Coral is a large polyp stony coral, which is commonly referred to as the Cat's Eye, Tooth, Button, Teary Eye, or Meat Coral. The Red Doughnut Coral is considered one of the largest single-polyped corals, which are also found in different shades from pastel to bright and translucent. Though the Red Doughnut Coral is not an aggressive coral, it should be provided with adequate space in the tank, because it expands its size to twice its compacted shape. The Red Doughnut Coral is also easy to maintain, which makes it a very good choice for both beginner and an advanced aquarist. The Red Doughnut Coral requires medium lighting along with low water movement for its proper growth. If it is given additional calcium, strontium, or other trace elements in the water, the Red Doughnut Coral has proved these additives to be beneficial for it continued good health. The Red Doughnut Coral can be fed with meaty foods such as microplankton or brine shrimp at night. The Red Doughnut Coral thrives well in a temperature range of 72-78 degrees Fahrenheit and pH of 8.1-8.4. The Red Doughnut Coral has a thick and fleshy exoskeleton . The Red Doughnut Coral does derive the nutrition via photosynthesis with the help of zooxanthellae that dwells inside its tissues.