A new experiment might yield some interesting results:
what about soaking the sheet on nori in RO water for some period of time before adding to the display? The test already done could be your control, now maybe soak a sheet for 5 mins and another for 15 mins and then transfer them into a fresh batch of RO water and see what PO4 says. I know nori sheets are always a little flaky/dusty, so it could be that those ragged areas are dissolving quickly. The thicker sections of the nori might not release as much into the water (though admittedly it'll still end up in the poop).
I don't know if anyone's mentioned it in this post, but has anybody tried vodka for PO4 reduction? I haven't had enough of a problem to experiment with it yet, but the feedback I've seen on the RC Chem forum has been encouraging.
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