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Thank you, the ORP almost immediately started rising and stabilized at the previous level at the 5 hour mark. Stable since. Interesting!!!This does not necessarily even have to be connected to small organisms dying in shipment - although I'm sure there was some of that.
Algae can be expected to have a lot of reducing agents (to defend against photo oxidation from the sun), and so it would not surprise me that a bag of it, or dried sheets of it, drops ORP significantly over a short period.
I'm curious if a stable population of microalgae in the tank permanently lowers ORP by some measurable amount. Update us when the system stabilizes, please.