Can you turn on individual bulbs? If so start with 2 then a month later or so do 4 then a while later do all six.
If you can move your fixture then start it with all bulbs high above the tank and then slowly lower it over time to the desired position.
OR have 2 or 4 bulbs on and have all corals placed low in the tank and then after a while turn all bulbs on and then after a longer while move the corals up slowly.
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