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A 7.8 to 8.3 dirurnal swing is common and ok. Photosynthesis by corals and algae uses CO2; when lights are off, that stops and some CO2 is respired. More CO2 drives pH down as it makes the water more acidic. Opposite photoperiod lighting for refugia , integrated tanks. etc. with enough photosynthesis occurirng in them will even it out over the 24 hour day.
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Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
Last edited by tmz; 11/23/2015 at 11:06 AM.
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