Randy Holmes-Farley
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They could have not only bound the QAC directly, but also ate algae with the QAC bound?
That's an interesting point. Organisms that eat materials that could have complexed vibrant might get more into them than from simple water exposure, and exposure to the contents of the GI tract might digest away some of the nonvibrant parts of a complex.
That might even relate to filter feeders like clams, and could be an effect that builds over repeated doses even if the aquarium water is not rising in concentration. The stuff being eaten may get more and more saturated with the polymer.