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Ditto on the above—most plants just grow better at KH’s 4 and below. Some plants like some toninas, eriocaulons, and plants in the lythracae family (some Rotalas and ammanias) need KHs below three to grow at all or not stunt heavily. So it depends on the plants you want to keep, if you’re keeping easier more generic plants it isn’t really necessary.

In terms of CO2, the KH level does not affect how much CO2 you have in your tank at any given time. It just makes it easier for plants to photosynthesize and access the CO2 when the KH is lower. If you’re having trouble getting the drop checker to be green/lime green, that’s an issue with your CO2 set up and diffusion and unrelated to your KH.

Buying RO water for a 25 gallon sounds like a headache to me. If I were you, I would look into easily installable and removable RO units like the RO buddie - AQUATIC LIFE RO Buddie Four Stage Osmosis System, 50-gal - Chewy.com
 
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