Well, with low flow rates relative to a large tank, it's not going to remove much CO2.
And the bacteria should do pretty well inside, but that typically is not such a big issue with plants and high O2.
It's hard figuring out the balance between the bacteria and maintaining the plant growth rates to prevent decline in the water/algae blooms etc.
I think overall, the driving factor is plant growth much more than a filter.
Filters are namely back up Bio but you could use chemical and mechanical aspects.
To minimize the role of filtration: less light, large water changes, good consistent dosing, good consistent CO2 when the lights are on, and think that should do it.
More flow should do more than the low flow filter if the plant's needs are addressed and the tank is set up to provide simple easy management(lower light/good CO2 etc)