I've actually seen this happen quite a few times when treating mags. It's almost like they are constipated and have one final big push to purge the remaining dead zoox and/or waste. It's really the make it or break it point for the nem. If they're strong enough to do a complete purge, then they're fine after that.
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Tank info: 120 gallon 48x30x20 high DT. Clownfish breeding rack in full swing: C-Quest Onyx, Bali Aquarich P1 Picasso + Rod's Onyx, wild percula + Rod's Onyx.
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