Practical guide to safely packing and shipping corals: temperature control, leak prevention, oxygen management, seasonal precautions, and techniques for frags and colonies.
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Practical guide to safely packing and shipping corals: temperature control, leak prevention, oxygen management, seasonal precautions, and techniques for frags and colonies.
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As peer-to-peer coral trading and direct sales from breeders become increasingly common, "transport damage" is among the most frequent problems. Corals are sensitive to rapid changes in water quality and temperature, and transport stress often causes bleaching or tissue detachment after arrival.
Conversely, knowing the correct packing and transport methods makes it possible to deliver corals in healthy condition even over long distances. This article explains practical coral transport techniques from both the shipper's and recipient's perspectives.
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Begin preparing corals for transport 2–3 days before shipping.
Stop feeding 48 hours before shipping. When undigested food is released during transport, water quality deteriorates rapidly, and ammonia levels in the bag spike accordingly.
When shipping frags cut from a colony, allow at least one week of healing time after cutting. Corals with incomplete wound closure face significantly higher infection risk from transport stress.
Verify polyp extension, coloration, and tissue condition. Delay shipping of any coral showing problems. Transporting stressed corals almost always results in damage.
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Gather the following materials in advance:
| Material | Purpose |
|---|---|
| Thick plastic bags (double-layered) | Hold coral and seawater |
| Rubber bands / zip ties | Seal bags |
| Newspaper / paper towels | Cushioning / water absorption |
| Expanded polystyrene box | Insulation / shock absorption |
| Ice packs or hand warmers | Temperature regulation by season |
| Bubble wrap | Prevent bag interference |
| Vinyl tape / packing tape | Seal boxes |
Keep the water volume minimal relative to coral size. The goal is to maximize air (oxygen) space in the bag. Water should fill approximately one-third of the bag, with the remaining two-thirds filled with oxygen.
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Packing frags (small pieces) is relatively straightforward.
If the frag rolls around inside the bag during transport, polyps can be damaged. Effective stabilization can be achieved by placing a small rolled-up wet paper towel beneath the plug base to restrict movement. If the frag is already attached to a coral mount, placing it directly in the bag increases stability.
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Colony-sized corals require different considerations than frags.
Adding large amounts of water increases weight and damage risk. For short-distance transport (next-day delivery), wrapping the coral in seawater-saturated newspaper or paper towels and placing it in a sealed bag is effective. Many coral farms use this method.
This method eliminates the risk of the coral rolling around in water and is especially effective for large specimens.
Branching corals such as Acropora and Flower Anemone Coral can have branches break against each other during transport. Stabilize by inserting wet paper towels between branches, then cover the entire coral with bubble wrap before bagging.
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Corals thrive at 24–26°C, but transport conditions are heavily influenced by ambient temperature.
When outdoor temperatures exceed 30°C, ice packs must be included.
When outdoor temperatures drop below 10°C, use disposable hand warmers for insulation.
When temperatures range 15–25°C, the insulation from the expanded polystyrene box is often sufficient. However, on days with large temperature swings, add a hand warmer or ice pack as a precaution.
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An expanded polystyrene box is essential for coral transport. Cardboard boxes lack adequate insulation and are poor at shock absorption. These are available through online retailers and home improvement stores, or you can request used boxes from fish markets.
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In all cases, inform the carrier at pickup that you're shipping in an expanded polystyrene box and request careful handling.
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Proper recipient handling is equally important for transport success.
Corals remain stressed for 24–48 hours after arrival.
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The most common problem. Double-bagging and lining the box interior with plastic prevents external damage even if leakage occurs.
Extended transport (24+ hours) can deplete oxygen in the bag. If pure oxygen filling isn't feasible, maximize air space in the bag to compensate.
When corals release mucus in the bag, ammonia spikes rapidly. Beyond pre-transport feeding cessation, including ammonia-absorbent packets (small zeolite bags, etc.) in the bag is also effective.
If transport takes longer than expected, ice packs or hand warmers may lose effectiveness, causing sudden temperature changes. Don't rely solely on expanded polystyrene insulation—employ season-appropriate precautions with safety margins.
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In direct coral sales, transport quality directly reflects trust.
Getting corals to the new owner's tank in excellent health—that's the breeder's greatest satisfaction and the trust foundation for repeat purchases.
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Coral transport isn't difficult with proper knowledge and careful preparation. Double-bagging, temperature management, shock prevention, and post-arrival acclimation—executing these fundamentals reliably prevents most problems.
Especially in direct breeder sales, transport quality directly reflects your reputation and credibility. Even if it takes time initially, develop the habit of packing each coral carefully and thoughtfully.
