my friend had a what i thought was a completely bleached and dead Christmas tree rock in his tank, with the colorful dusters still doing good tho. he left to go up north and his mom asked me how she should care for the tank and i told her just do 10% volume water changes weekly with a refractometer instead of a really poorly calibrated salinity probe. i was amazed when i came back a few months later and saw the SPS part of the rock was coming back.
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