Donut Coral

Care at a glance

Overview

Donut coral is only mildly aggressive, occasionally extending short feeder tentacles at night, so a few inches of clearance from neighbors is enough. It is one of the most dramatic feeders in the hobby, all but turning itself inside out to wrap around a piece of krill, silverside or LPS pellet, and spot feeding a couple of times a week noticeably speeds its growth. Because it is a single free-living polyp, it is not propagated by fragging, so nearly all specimens in the trade are wild collected, which keeps large, brightly colored pieces expensive. Handle it carefully out of water, since the spiky skeleton under the retracted flesh can scratch bare hands.

In the wild

Acanthophyllia deshayesiana comes mainly from deeper, soft inter-reef areas around Australia and Indonesia, where a single polyp sits loose on sand or fine rubble rather than cementing to rock. In the aquarium it wants low light, roughly 30 to 100 PAR, and low, gentle flow, since its skeleton is sharply spiked underneath the flesh and strong current can expose or damage the tissue. Place it directly on a soft sandbed in a shaded lower spot, away from sharp rock it could settle against. Keep temperature 24 to 27 C and pH 8.1 to 8.4.

Good to know

Acanthophyllia deshayesiana is a large polyp stony coral in the family Lobophylliidae and the only species in its genus, long sold and studied as Cynarina deshayesiana until a 2016 study separated Acanthophyllia back out as its own genus. That shared history is why hobby common names still overlap heavily with Cynarina and Homophyllia. Underneath its thick, fleshy tissue sits a distinctly spiky skeleton with long pointed septa, a strong contrast to the smoother skeleton of a button coral.

Did you know

A large donut coral can inflate to dinner plate size, several times the width of the compact skeleton hidden underneath, which is why a coral sold as a 4 or 5 inch skeleton can end up looking twice that size once it settles into a tank.

Related species

• 

  Lobed Brain Coral

  Lobophyllia

  9.8 in (25 cm)20 gal (75 L)75–81°F (24–27°C)
• Grooved Brain Coral

  Lobophyllia recta

  9.8 in (25 cm)26 gal (100 L)75–81°F (24–27°C)

• 

  Acan Coral

  Acanthastrea echinata

  7.9 in (20 cm)11 gal (40 L)75–81°F (24–27°C)

• 

  Chalice Coral

  Echinophyllia

  13.8 in (35 cm)20 gal (75 L)75–81°F (24–27°C)

• 

  Acan Lord Coral

  Micromussa lordhowensis

  5.9 in (15 cm)11 gal (40 L)75–81°F (24–27°C)

• 

  Scoly Coral

  Homophyllia australis

  5.1 in (13 cm)11 gal (40 L)75–81°F (24–27°C)