First your fish probably adapted to being in slightly high ph water unless that is a change within a day.
Second, adjust your co2 and measure ph/kh after it has been onl throughout the photoperiod and see how much co2 you have in the water. Of course this will only be accurate if you don't have substrate that changes those parameters.
I inject co2 at a pretty high amount(4-5bps ~40ppms) and my fish are not gasping at all and I have zero airstones in my tank just a Lily pipe under the water surface.
You need to find the balance of the tank.
ction over form
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