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Coral Light Acclimation


Drs. Foster & Smith Educational Staff
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Coral Light Acclimation for New Arrivals Coral Light Acclimation for New Arrivals

Safe is always better than sorry, especially when acclimating new coral arrivals to your aquarium. Careful light acclimation is often the deciding factor in successful transplants. Without proper light acclimation, corals can bleach, burn, or become severely damaged.

Understanding Coral Light Acclimation
While most hobbyists are very diligent about conventional water temperature and water chemistry acclimation, coral light acclimation remains somewhat unfamiliar. After carefully researching the light requirements of a particular coral, many reef hobbyists are anxious to immediately place new corals in the brightest location, closest to the light source. This may seem appropriate, but in many situations, it can cause more harm than good.

Keep in mind that lighting conditions vary from aquarium to aquarium. No two fluorescent or metal halide systems have identical light properties. Therefore, a coral acclimated to artificial lighting from one system (e.g., a pet store or an online retailer) will need to gradually adjust to different lighting conditions when introduced to a new aquarium system.

Acclimating Your Coral

How long should I take to acclimate my new coral?
Acclimation of any aquarium inhabitant needs to occur slowly. For corals, however, the process is considerably longer - up to a few
months. Start with new coral low in your aquarium until it has adjusted to the lighting. Then gradually move it to the preferred location.
Regardless of your light setup, place all new corals on the bottom of your aquarium until they begin to adjust. If you employ metal halide lights, place some sort of screening material above your coral during the first few weeks of acclimation. The screen could be egg crate light paneling or fiberglass mesh. Also, reduce the photoperiod by a quarter for the first week and gradually add an hour each week to reduce the risk of light shock. A good indication your coral has adjusted is when it appears fully expanded and displays full coloration.

Slowly inch the coral to its preferred location over the next month or so. Generally, brighter colored corals should be nearer to the lights. Bright colors signify tissue pigment development that helps protect coral from the UV-light present in shallower depths. Though proper light acclimation is a slow process, it can be the difference between a home reef that simply sustains and one that thrives for years to come.

ESSENTIALS
LUX Light Meter measures light intensity in your aquarium with professional precision.
Aquatic Forceps are available in three stainless steel sizes for easy coral positioning.
Coralife Power Center is a 24-hour multi-timer system to automate your lighting setup.
RELATED INFORMATION
Choose the Proper Lighting for Your Aquarium
Colors of Corals
Illuminating the Subject of Lighting
How to Propagate Your Own Coral Frags at Home
Professional Guide to Metal Halide Lighting
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