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Gonna turn into another petco thread
These nems don't bleach overnight. I don't know how it takes down to the day, but I'd think it takes at least a week (based on my experience treating them -- I'll explain more). I'm will to bet that they arrived at the wholesaler that way. I'd estimate that of all of the mags I've seen lately, probably half are bleached.
IME bleached mags do quite well, it just takes them a while to gain their color back.
While treating sick mags with Cipro, they tend to bleach by expelling a lot of dead zooxanthellae. If the exporter or wholesaler attempted to treat the mags, it could explain the bleacning (along with them being held in an environment with minimal lighting).

