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FYI, try not to focus on the ORP numbers. They are meaningless. What does the 400mv tell you to do? Just look at the tank. If it is crystal clear then it is working. If you run an orp controller then it would come on/off 24hrs a day. I'ld rather have it run when we are asleep away from the tank rather than during the day when we are standing in front of the tank. Less exposure to ozone is good. It doesn't take much ozone to have crystal clear water. It is not dependent on ORP.
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Guitar playing reefer
Current Tank Info: 300g & 90g display, 90g fragtank, 34g fuge, 120g sump1 w/ RO Xp-5000, 20g sump2 , 5 (2x54wattT5 retrofits) 3 radion xr15pros, 5mp60s, 4tunze6255s, Apex, WXM, KnopCaRx, Avast KalkRx
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