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Some nitrates and phosphates are good for corals. Maybe stripping the nutrients too fast in your tank upset the coral.Oh! I thought I did post a pic.
feel like this has gone beyond lighting. It had lots of phosphates, a bta sting it and then it got knocked down. I only turned the lights down by an hour, not by any intensity.
All my parameters are the same as in the original post, except that my nitrates and phosphates are 0 now.