So you have to turn off the Kamoer and the co2 every time your return pump turns off? Does that become a pain?
Not an issue. The Kamoer keeps running and I haven't run into any issues when doing my water changes. You can easily program your Apex to turn off the Kamoer though if your setup needs it off. I could turn it off with my Alkatronic BT adapter though if I need to do so. Really nothing to overthink honestly.