the pH may drop (or stay steady but low), especially during the day when the tank may run at a CO2 deficit relative to the air used.
I´m sorry I do not get this. My tank run always high in pH during day (during the photoperiod) because that the photosynthesis consume carbon dioxide faster than it is produced by living organisms or transferred through the air/water interface. What have I missunderstand?
But here in Sweden with very isolated houses – it is a problem with the carbon dioxid content indoors. 600 ppm indoors (two persons) is common. I know people that has measured 1200 ppm CO2 in their sump cabinet during night!
If you in top of this use a calcium reactor – you can have some problems to get higher pH than 7.9 - 8.
Today its rather common here to use a CO2 scrubber in order to get up the pH during night time.
In my old aquarium my pH was normally between 8.2 – 8.5. But when my two grand children was sleeping over and was awake – the pH dropped at least 0.1 unit! It was possible to se when they wake up during the morning because I always get a pH drop on 0.1 units in that moment
Sincerely Lasse
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