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I don't know much about sw aquariums but if it happened suddenly it may be due to stress?? A lot of fw fish do I dunno if it is the same for sw but I would do a water test and salinity test and have a good look to see if there are any injuries. Hope this helps, good luck
I don't see the harm. I forgot the mention a lot of my fish look discoloured when they wake up. Just keep an eye on him and see how he goes. Best of luck.