Diploastrea heliopora
| Care Level | Easy to moderate |
| Lighting | Moderate |
| Water Flow | Moderate |
| Placement | Rock, low to mid tank |
| Aggression | Peaceful |
| Coloration | Green, tan, with contrasting centers |
Overview
Diploastrea heliopora is a prized, slow-growing brain coral that forms a heavy, dome-shaped colony of remarkably uniform, tightly-packed corallites — a neat honeycomb that gives it the nickname “green-eye” or honeycomb coral. The best pieces show a striking contrast between a green or tan body and bright corallite centers. It is exceptionally hardy and long-lived, but famously unhurried in the tank.
Care & Placement
Easy to moderate. Diploastrea asks for little beyond stable water, moderate light, and moderate flow, placed on rock in the low-to-mid tank. Its one demand is patience: it is one of the slowest-growing corals in the hobby, so buy the size you want to display. In return it is extremely durable and tends to sail through conditions that stress flashier corals.
Feeding
Photosynthetic and very self-sufficient. It will accept small meaty foods and micro-plankton, and occasional light feeding can support its (slow) growth, but a healthy colony needs nothing more than good light and clean, stable water.
Propagation
Rarely fragged, largely because it grows so slowly that cutting a colony is a big commitment. It can be sawed like other massive brains, but recovery and regrowth are measured in the long term, so most Diploastrea are sold as whole colonies.
Cautions
Few. It is peaceful and does not have long sweeper tentacles, so it will not harass neighbors, though as a valuable, slow grower it should be protected from more aggressive corals that could sting it. Do not expect visible growth quickly — that is normal for this species, not a problem.
Frequently Asked Questions
Why is Diploastrea so expensive?
It is slow-growing and cannot be mass-fragged like faster corals, so supply is limited, and well-colored “green-eye” pieces are highly sought after. Its hardiness and clean, geometric look add to the demand.
Is Diploastrea hard to keep?
No — it is actually one of the hardier brain corals, tolerant of normal reef conditions with moderate light and flow. The only real challenge is patience, because it grows very slowly.
Is Diploastrea aggressive toward other corals?
It is peaceful and lacks the long sweeper tentacles of corals like bubble or galaxy coral. If anything it is the one that needs protecting, since aggressive neighbors can damage this slow-growing, valuable colony.