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Old 10/27/2017, 04:16 PM   #2
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Join Date: Mar 2002
Location: Mountain View, CA, USA
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An anaerobic and photosynthetic zone would be hard to accomplish. Photosynthesis produces a lot of oxygen. Is there a reason you'd like to area to be anoxic?

ORP is a complicated issue in an aquarium:

I am not sure that it'd work well as a proxy for an oxygen probe. I'm not sure what the status is for monitor dissolved oxygen content, but I think it'd be pricy. Is one of the goals supplement calcium and alkalinity? Vinegar would be fine for feeding bacteria, and it's very cheap. Calcium acetate makes a good, if sometimes expensive, calcium and alkalinity supplement. It'll fuel bacteria just as well, though.

Jonathan Bertoni
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