Aeration is the only thing that solved my PH issues, I highly recommend it as a first cheap attempt to solve any PH issue high or low. Typically id recommend people to perform both an indoor and outdoor aeration test to find out if they have high co2 inside the house depressing the PH, but your problem is the reverse (low co2.)
I have a single large airpump with 2 large airstones and its locked my PH into 8.2-8.3 all day long 24/7. I was also running a skimmer but it just wasn't enough to keep everything in equilibrium.
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