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I use a CO2 scrubber and dose additives to keep my PH high as I notice the tank loves high PH, so when I'm away and there's no CO2 in my apartment it hits 8.8 at it's peak. My warning would be my tank consumes 3 times as much alkalinity at 8.8 as it does at 8.3. The difference is growth is easily noticeable, corals grow more in a few days with an 8.8 peak than in a month with an 8.3 peak. Not sure if it's necessary or not but I assume all the growth must lower nitrates since nutrients are likely being absorbed at an increased rate so I also feed my corals heavily.