Strange slow bleaching

SCARYBO

New member
I am having an issue with my tank that I cant seem to locate the cause. My sps are slowly losing color. It starts out to slowly use the brown. The corals develop a pastel look. From there the sps slowly loses the color and fade to a white. It takes about two weeks for the process to occur. All parameters are in line. I dont know what is causing this. Any ideas what I should look at would be appreciated.
 
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