So I have had my Apex running for 6-7 months now. ORP was 350-400 for first few months. I had accidentally used a brass fitting with a flow sensor, and orp dropped quickly after a few days. Was about 180-200 at low, corals looked bad. Quickly realized what went wrong, removed fitting, ran carbon and poly filter, and orp came back up to about 250 to 275 max. Why hasn’t the number come up to original highs? I see most of my friends tanks are 375 average....
Any thoughts?
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