Is this coral suitable for beginners?

Haimatsu Midori-ishi (Acropora millepora) is generally considered an advanced-level coral. It requires strong lighting, strong flow, and stable water chemistry, so it's best suited to keepers who already have experience with other corals.

How large does it grow?

Colonies typically reach a diameter of several tens of centimeters. Growth rate varies with tank conditions, so it's worth planning for the space a mature colony will need.

Where should it be placed in the tank?

Since it's a shallow-water species that favors strong light, placing it high in the tank where light is strongest usually works well. Flow should also reach through the branches, not just around them.

What causes its color to fade?

Insufficient lighting or unstable water parameters can dull coloration over time. Reviewing placement, lighting, flow, and water chemistry is usually the first step to address it.

Are there any legal regulations on this species?

This species is not subject to CITES.

Acropora Millepora

Acropora millepora — sold under the Japanese name Haimatsu Midori-ishi, or "Millepora" — is a reef-building coral in the Acropora family whose short, cylindrical branches spread outward into mounding colonies. Its corallites are uniform in size with flared lower edges, giving the branch surface a distinctive scale-like texture. Coloration is highly variable, ranging from green branches tipped in orange to soft pink, solid orange, and vivid blue, so individual colonies can look strikingly different from one another. It favors shallow water with strong lighting and vigorous flow, and grows best in that kind of environment, which is why it's generally considered a coral for keepers who already have Acropora experience. Watching its skeleton spread outward over months and years is part of the appeal, and a well-grown colony can become a real centerpiece in a reef layout.

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About Acropora Millepora

Acropora millepora (Haimatsu Midori-ishi) is an Acropora coral known for its green, orange, pink, and blue color variants. Learn about its light and flow needs, advanced care level, and what to know before keeping one.

7 things to know before welcoming a Acropora Millepora

1Needs Strong Light
In the wild, this coral lives in shallow, brightly lit water, and it needs strong lighting in captivity too. Without enough light, growth slows and coloration tends to flatten out. Placing it near the top of the tank or on elevated rockwork usually works well.
2Needs Strong Flow
Water needs to move through and around the branches rather than sit stagnant, or tissue can suffer. Random, turbulent flow tends to work better than a single strong jet aimed directly at the colony.
3An Advanced-Level Coral
Its skeleton is relatively sturdy for an Acropora, but overall care is considered advanced. Keeping calcium, alkalinity, and magnesium stable takes experience and consistent monitoring.
4Highly Variable Coloration
Colonies range from green branches tipped in orange to soft pink, solid orange, and blue. Even under similar conditions, lighting and water chemistry can shift coloration over time, which is part of the appeal.
5Grows Into Mounding Colonies
Short cylindrical branches gradually spread into a mounding colony that can reach several tens of centimeters across. Grown branches can also be fragged to propagate new colonies, letting you track its growth over the long term.
6Watch Tissue Health
Bleaching or tissue recession (sometimes called STN/RTN) can occur, so it's worth regularly checking branch tips and surface color for changes. Catching issues early and adjusting flow or water quality helps limit further damage.
7Prepare Your Setup First
Before bringing one home, confirm you can provide strong lighting, ample flow, and stable water parameters. Introducing it into an unprepared setup often leads to color loss or tissue recession.

Frequently asked questions about Acropora Millepora

Q.Is this coral suitable for beginners?: A.Haimatsu Midori-ishi (Acropora millepora) is generally considered an advanced-level coral. It requires strong lighting, strong flow, and stable water chemistry, so it's best suited to keepers who already have experience with other corals.
Q.How large does it grow?: A.Colonies typically reach a diameter of several tens of centimeters. Growth rate varies with tank conditions, so it's worth planning for the space a mature colony will need.
Q.Where should it be placed in the tank?: A.Since it's a shallow-water species that favors strong light, placing it high in the tank where light is strongest usually works well. Flow should also reach through the branches, not just around them.
Q.What causes its color to fade?: A.Insufficient lighting or unstable water parameters can dull coloration over time. Reviewing placement, lighting, flow, and water chemistry is usually the first step to address it.
Q.Are there any legal regulations on this species?: A.This species is not subject to CITES.