Honestly I think it was just stress from the move. I doubt salinity at 1.027 did anything, mines usually around 1.025 - 1.026. There was a move and a different light, corals tend to take time to adjust especially to new lights.
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I agree, some of my mushrooms are in 35-45 par and they love it, some are closer to 100, anything over that they begin to sufferMushrooms can thrive in a wide range of light, shouldn't be a big issue.