Adding coral to a marine aquarium takes more than floating a bag and choosing an attractive spot. Differences in temperature, salinity, light, and water movement can stress a new specimen, especially when changes happen quickly. Prepare your tank and supplies before opening the package, then follow a measured acclimation process that fits the coral’s needs. Careful inspection and a conservative initial placement give the coral time to adjust while you watch for signs of trouble.
Prepare the Aquarium First
Check that the aquarium is stable before introducing coral. Measure temperature and salinity with reliable equipment, and confirm that your usual water-quality readings are in their normal range. Avoid adding coral during a major maintenance task or while correcting a sudden imbalance. If the tank is new or its conditions are changing, wait until they have remained steady and you can monitor the coral closely.
Set up a clean acclimation container, thermometer, refractometer or other salinity test, coral dip if appropriate, and separate rinse water made with aquarium water. Gather gloves and coral-safe tools before opening the shipping bag. Keep the container away from direct sunlight and strong airflow. Never pour shipping water into the display tank; it may contain waste or substances you do not want in the aquarium.
Inspect and Acclimate Gradually
Float the sealed bag in the aquarium or a temperature-controlled area until the water temperature approaches the tank’s temperature. Follow the supplier’s handling guidance, particularly if the shipment has been delayed or the bag water smells unusual. Once you open the bag, compare its salinity with the aquarium. A large difference calls for a careful, controlled adjustment rather than an automatic, extended drip-acclimation routine.
Transfer the coral and its water to the clean container, then adjust conditions gradually using a method suited to the difference and the coral’s condition. Measure salinity as you go instead of relying only on elapsed time. Keep the coral submerged when practical, and avoid exposing delicate tissue to air or rough handling. Acclimation methods vary by species and shipping conditions, so follow the supplier’s instructions when they differ from a general routine.
Inspect the coral for damaged tissue, pests, or unwanted material. A coral dip may help manage hitchhikers, but use only a product labeled for coral and follow its directions exactly. Dip and rinse in separate containers; never return dip water to the aquarium. Do not dip a coral that appears severely stressed without first checking whether the treatment is appropriate for that specimen.
Choose a Conservative Placement
Start the coral in a stable area with moderate light and gentle, indirect flow unless its care requirements call for something different. Avoid placing it directly under intense lighting or in a strong current immediately after transport. Research the coral’s light and flow preferences, and consider where it can expand without touching neighboring corals. Leave room for future growth and for safe access during maintenance.
Secure the coral with an appropriate reef-safe method so it cannot topple or drift into another specimen. Keep it away from aggressive corals that can sting, and avoid setting it where sand or debris will settle on its tissue. If you use adhesive, apply it carefully and keep it away from living tissue. Do not make several major changes to lighting or water flow at the same time.
Monitor Before Making Changes
Watch the coral over the following days for tissue damage, persistent retraction, unusual discoloration, or pests. Some corals may take time to extend or display their usual appearance after shipping, so assess the overall trend rather than reacting to one brief change. Keep a record of placement and water readings; this makes it easier to identify whether a problem follows a change in conditions.
If the coral shows concerning symptoms, check water quality and observe its neighbors before moving it or adjusting equipment. Correct confirmed problems gradually, and seek species-specific guidance when symptoms persist. Brooklyn Reef Co. can help you review coral care and placement questions; bring the coral’s species, recent readings, and a description of changes you have made.
Safe coral acclimation starts with a stable tank, prepared supplies, and measured adjustments. Inspect the specimen, choose a suitable initial location, and monitor it before changing several conditions at once. Use care specific to the coral and its shipping history, and ask for guidance if you are unsure about the next step.