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Originally Posted by NATIVEVAMAN  The best plan is to put 3 layers of screen wire between the lights and the water and remove one every 2 or 3 days.The idea is to acclimate the corals to adifferent intensity over time. |
Ditto. You can replace them all at once, since they are shining on different areas of the tank, but you should screen the bulbs at first so that the intensity doesn't jump drastically and harm your corals.