Not trying to derail your thread this is a ORP related sorry OP if I’m hijacking your thread but this is information on ORP. So for what it’s worth I installed a UV sterilizer couple days ago as you could see in the graph the dip is when I did the water change that I was questioning why is ORP so low and then you can see over the two days or so that the UV sterilizer has raised my ORP from 220 to over 275 It’s still climbing. With that being said I will 100% tell you my curls look better in the two days alone with a higher or RP I can also tell you strange thing the fish I’ve had for many years over for five we’re out swimming last night with the lights off and they’re normally just hiding that could be a coincidence but at 1 o’clock in the morning my tangs We’re swimming the length of a tank out in the open