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pH shift is a natural part of photosynthesis rates changing whether their is light or not.
It would be more important to keep Alk levels stable than your pH - In my opinion and from my experience.
When my alk is dialed in and rock solid - my corals are happier.
Doesn't matter what my pH is doing.
When there is an issue with my corals not looking their best - pH is never a concern for me. There is some other culprit.
Dave B
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560g Display. 1500g System Volume. (2) 180g Outdoor Frag Tanks. 340g Sump, 30g 2 story surge tank. Dasatco EXT 9. Bubble King Skimmer. Ozone. UV. 5' Fluidized Sand Filter. Avast Kalk Mixer.
Current Tank Info: 560g SPS Dominant Reef / 1500g Total System
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