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A non CO2 tank will have daily fluxes in the pH.
If you think the pH is stable in those tanks and can be maintained as such, you are in for a rude awaking.

Some planted shallow pools go from 6 to 9 daily in natural systems. I have caught native killis here in these same places, and I see no reason why elsewhere would any different in terms of the environment. Both are tropical, both have plants, both have soft water etc.

Will the fish do well in a non CO2 tank? Yes.
Since you are not doing water changes and you should add a bi cab user like Egeria, the softness will not matter. The plants will export out the KH/GH.

Tom Barr
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