I think any decaying organic matter would cause a spike, be it uneaten nori or fecal matter post nori consumption. I'd be interested to hear how much is being fed and how large of a tank we are talking about.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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