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Thanks for the information. This might be why my yuma is unhappy. I have been topping off once or twice a day. I don't have an automatic top off system.
Do marine algae and corals have the same respiration/photosynthesis patterns as FW aquatic plants? If so, then the ph would be lower in the morning as the algae and corals produce co2 through respiration and higher in the evening as the algae consumes co2 through photosynthesis. It might be worth testing for a while to get a baseline as to how drastic that swing is.
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