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antecodally... i'm noticing the ORP increase in my QT tank as it ages and the biowheel becomes more seasoned. When I first set it up, biowheel was new, water was new and required daily water changes to keep ammonia levels down, ORP rarely broke 200. Several weeks later I'm regularly seeing ORP values over 300 and the water is much more stable. I haven't performed any controlled experiments, this is just my observation.
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