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Most lps can handle no light for 5 days, the problem comes when u hit them with to much light at once after lights out. I don’t think the grow light is strong enough to help the coral & probably only helped out the algea. I agree with desertreef, I would turn the lights way down & slowly ramp them up ever 5 to 7 days.
It isn’t the lights themselves causing your issues which I’m sure u know being u have had success with the same lights for a few years. I think they just got hit with to much light after being under the weak grow light. A lot of lps & euphylia in perticular can handle quite a bit of light, but they have to be acclimated properly
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