The temperature is 25C, also how could low oxygen cause low pH, like Ryan says its CO2
which dissolves to form carbonic acid...
I have a raised metal hood with my
Lights installed inside it, I doubt it can be restricting airflow too much, also my two power-heads are practically pointing straight up at the surface now to agitate it and increase gas exchange
The only thing left for me to suspect as the cause is my homemade live rock, however can anybody tell me how they can lower the pH when they are made with highly caustic high pH cement, and needed to be cured to bring the pH if the rocks Down!