My Apex is new and I have the ORP probe in an IM Nuvo 38g. It's well stocked with fish, inverts, corals. I run the IM skimmer in left column and 3-stage stock sponge filters (mechanical, carbon, phosphate) in the right column.
After a weekly water change, my ORP reads 300. By the end of the week, it's down to 230. Can someone help me interpret what this means and if it's good or bad.
Thanks.
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