Coral Bleaching
Sam,
If you are running a 400W over your tank you will need to do light acclimation. Start out with the corals down low then slowly raise them up to the location you want them to be at over a few days to weeks. I only run a 250W so I don't know the time frame most will follow. Tho I'd say take it slow.. better safe than sorry..
I'd say you are shocking them. LFS's generally don't run 400W MH's, 250's yes. 400W's no.. lol
Try that..
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