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I wouldn't do a large water change, just your regular water change. Calcium will come down on its own and I would start bringing the Alk. up slowly till you get around 9 dkh. A one year old tank is pretty young, you have to stay on top of these numbers. My tank is maybe a year older than yours, I test Alk. pretty much every other day & Calcium every third day.Most case if SPS turn light in color more like bleached they lack some sort of nutrients.
Light can be the issue too.
If the rest of your corals/SPS look good this might be one of the difficult SPS or it hasn't much PE when it needs to.
What are you # in your water! po4, alk, cal, mag, k,
You can find a lot in there most cases.
Also check for pest if it is just one coral.
Overall give us a little more info about all above mention.
You have any pictures on hand from the coral in question?


