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If you want to be cautious, seems most of us use BRS ROX or Seachem Matrix (mostly ROX, as it's cheaper but still high purity). And most tend to use ferric oxide-based (GFO) phosphate removers rather than Phosguard.
If you've consistently used a phosphate remover, I'd rather doubt your troubles were caused by a precipitous drop in phosphate levels. Nevertheless, I'd pull any phosphate removers for a little while. Phosphate takes a while to build up in a system, and some amount of phosphate in the water is necessary for coral health. So taking out any phosphate remover for a few weeks isn't going to cause your tank to crash, and may help your corals to recover.
And, if it were my tank, and I was absolutely sure of the purity of my RODI source, I'd do several 30% water changes in a row on a daily frequency. That would help to dilute any potential toxin that might've been accidentally introduced.
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