You don't worry about PH - that is how you solve it. Oxygen in your tank will not help. You need to drive off the CO2. The best way to do this, as you witnessed, is to decrease the CO2 in your home - basements are the worst. If your lights also came on during that time that you went from 7.75 to 8.01, then that also contributed. You can also drive off CO2 with kalk. Some people have used outside air in their skimmers, but with mixed results. I would either 1). don't sweat it, or 2). just open your house up a bit ever once in a while... we are really lucky that even in the brutal days of summer it is in the 60s in the mornings.
The acans might ingest a ton of food, but you can watch them spit most of it back out after a few hours to a day. Something like mysis is too big. Something like a pod, rotifers, cyclpos is better sized.